{"url":"http://public2.vulnerablecode.io/api/packages/227907?format=json","purl":"pkg:npm/ckeditor4@4.14.1","type":"npm","namespace":"","name":"ckeditor4","version":"4.14.1","qualifiers":{},"subpath":"","is_vulnerable":true,"next_non_vulnerable_version":"4.25.0","latest_non_vulnerable_version":"4.25.0","affected_by_vulnerabilities":[{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/11029?format=json","vulnerability_id":"VCID-17pr-6guy-53ge","summary":"Cross-site Scripting\nckeditor is an open source WYSIWYG HTML editor with rich content support. A vulnerability has been discovered in the clipboard Widget plugin if used alongside the undo feature. The vulnerability allows a user to abuse undo functionality using malformed widget HTML, which could result in executing JavaScript code. It affects all users using the CKEditor 4 plugins listed above at The problem has been recognized and patched. The fix will be available","references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2021-32808","reference_id":"","reference_type":"","scores":[{"value":"0.01368","scoring_system":"epss","scoring_elements":"0.80156","published_at":"2026-04-01T12:55:00Z"},{"value":"0.01368","scoring_system":"epss","scoring_elements":"0.80305","published_at":"2026-05-05T12:55:00Z"},{"value":"0.01368","scoring_system":"epss","scoring_elements":"0.80289","published_at":"2026-04-29T12:55:00Z"},{"value":"0.01368","scoring_system":"epss","scoring_elements":"0.80274","published_at":"2026-04-26T12:55:00Z"},{"value":"0.01368","scoring_system":"epss","scoring_elements":"0.80267","published_at":"2026-04-24T12:55:00Z"},{"value":"0.01368","scoring_system":"epss","scoring_elements":"0.80241","published_at":"2026-04-21T12:55:00Z"},{"value":"0.01368","scoring_system":"epss","scoring_elements":"0.80208","published_at":"2026-04-13T12:55:00Z"},{"value":"0.01368","scoring_system":"epss","scoring_elements":"0.80199","published_at":"2026-04-08T12:55:00Z"},{"value":"0.01368","scoring_system":"epss","scoring_elements":"0.80171","published_at":"2026-04-07T12:55:00Z"},{"value":"0.01368","scoring_system":"epss","scoring_elements":"0.80182","published_at":"2026-04-04T12:55:00Z"},{"value":"0.01368","scoring_system":"epss","scoring_elements":"0.80163","published_at":"2026-04-02T12:55:00Z"},{"value":"0.01368","scoring_system":"epss","scoring_elements":"0.80238","published_at":"2026-04-18T12:55:00Z"},{"value":"0.01368","scoring_system":"epss","scoring_elements":"0.80236","published_at":"2026-04-16T12:55:00Z"},{"value":"0.01368","scoring_system":"epss","scoring_elements":"0.80213","published_at":"2026-04-12T12:55:00Z"},{"value":"0.01368","scoring_system":"epss","scoring_elements":"0.80227","published_at":"2026-04-11T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2021-32808"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-32808","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-32808"},{"reference_url":"https://github.com/ckeditor/ckeditor4","reference_id":"","reference_type":"","scores":[{"value":"7.6","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/ckeditor/ckeditor4"},{"reference_url":"https://github.com/ckeditor/ckeditor4/releases/tag/4.16.2","reference_id":"","reference_type":"","scores":[{"value":"7.6","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/ckeditor/ckeditor4/releases/tag/4.16.2"},{"reference_url":"https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-6226-h7ff-ch6c","reference_id":"","reference_type":"","scores":[{"value":"7.6","scoring_system":"cvssv3","scoring_elements":""},{"value":"7.6","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N"},{"value":"HIGH","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-6226-h7ff-ch6c"},{"reference_url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NYA354LJP47KCVJMTUO77ZCX3ZK42G3T","reference_id":"","reference_type":"","scores":[{"value":"7.6","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NYA354LJP47KCVJMTUO77ZCX3ZK42G3T"},{"reference_url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NYA354LJP47KCVJMTUO77ZCX3ZK42G3T/","reference_id":"","reference_type":"","scores":[],"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NYA354LJP47KCVJMTUO77ZCX3ZK42G3T/"},{"reference_url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UVOYN2WKDPLKCNILIGEZM236ABQASLGW","reference_id":"","reference_type":"","scores":[{"value":"7.6","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UVOYN2WKDPLKCNILIGEZM236ABQASLGW"},{"reference_url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UVOYN2WKDPLKCNILIGEZM236ABQASLGW/","reference_id":"","reference_type":"","scores":[],"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UVOYN2WKDPLKCNILIGEZM236ABQASLGW/"},{"reference_url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WAGNWHFIQAVCP537KFFS2A2GDG66J7XD","reference_id":"","reference_type":"","scores":[{"value":"7.6","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WAGNWHFIQAVCP537KFFS2A2GDG66J7XD"},{"reference_url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WAGNWHFIQAVCP537KFFS2A2GDG66J7XD/","reference_id":"","reference_type":"","scores":[],"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WAGNWHFIQAVCP537KFFS2A2GDG66J7XD/"},{"reference_url":"https://www.oracle.com/security-alerts/cpujan2022.html","reference_id":"","reference_type":"","scores":[{"value":"7.6","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://www.oracle.com/security-alerts/cpujan2022.html"},{"reference_url":"https://www.oracle.com/security-alerts/cpuoct2021.html","reference_id":"","reference_type":"","scores":[{"value":"7.6","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://www.oracle.com/security-alerts/cpuoct2021.html"},{"reference_url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=992292","reference_id":"992292","reference_type":"","scores":[],"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=992292"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2021-32808","reference_id":"CVE-2021-32808","reference_type":"","scores":[{"value":"7.6","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-32808"},{"reference_url":"https://github.com/advisories/GHSA-6226-h7ff-ch6c","reference_id":"GHSA-6226-h7ff-ch6c","reference_type":"","scores":[{"value":"HIGH","scoring_system":"cvssv3.1_qr","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-6226-h7ff-ch6c"},{"reference_url":"https://usn.ubuntu.com/5340-1/","reference_id":"USN-5340-1","reference_type":"","scores":[],"url":"https://usn.ubuntu.com/5340-1/"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/38133?format=json","purl":"pkg:npm/ckeditor4@4.16.2","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-4x92-vapt-n7dz"},{"vulnerability":"VCID-8hvk-a5es-v3e4"},{"vulnerability":"VCID-cjwn-p59n-8ygs"},{"vulnerability":"VCID-h8tt-ky69-fuch"},{"vulnerability":"VCID-k7qp-c6vp-sqbg"},{"vulnerability":"VCID-un66-k85j-b7d2"},{"vulnerability":"VCID-uw7w-utew-ufb2"},{"vulnerability":"VCID-vc97-xds1-67gu"},{"vulnerability":"VCID-xhp7-kqdk-tfeu"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:npm/ckeditor4@4.16.2"}],"aliases":["CVE-2021-32808","GHSA-6226-h7ff-ch6c"],"risk_score":4.0,"exploitability":"0.5","weighted_severity":"8.0","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-17pr-6guy-53ge"},{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/11581?format=json","vulnerability_id":"VCID-4x92-vapt-n7dz","summary":"Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')\nCKEditor4 is an open source WYSIWYG HTML editor. The vulnerability allowed to inject malformed comments HTML bypassing content sanitization, which could result in executing JavaScript code. It affects all users using the CKEditor 4 at The problem has been recognized and patched.","references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2021-41165","reference_id":"","reference_type":"","scores":[{"value":"0.00117","scoring_system":"epss","scoring_elements":"0.30478","published_at":"2026-04-01T12:55:00Z"},{"value":"0.00117","scoring_system":"epss","scoring_elements":"0.29931","published_at":"2026-05-05T12:55:00Z"},{"value":"0.00117","scoring_system":"epss","scoring_elements":"0.30068","published_at":"2026-04-29T12:55:00Z"},{"value":"0.00117","scoring_system":"epss","scoring_elements":"0.30145","published_at":"2026-04-26T12:55:00Z"},{"value":"0.00117","scoring_system":"epss","scoring_elements":"0.3026","published_at":"2026-04-24T12:55:00Z"},{"value":"0.00117","scoring_system":"epss","scoring_elements":"0.30321","published_at":"2026-04-21T12:55:00Z"},{"value":"0.00117","scoring_system":"epss","scoring_elements":"0.30364","published_at":"2026-04-18T12:55:00Z"},{"value":"0.00117","scoring_system":"epss","scoring_elements":"0.30384","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00117","scoring_system":"epss","scoring_elements":"0.30366","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00117","scoring_system":"epss","scoring_elements":"0.30415","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00117","scoring_system":"epss","scoring_elements":"0.30459","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00117","scoring_system":"epss","scoring_elements":"0.30456","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00117","scoring_system":"epss","scoring_elements":"0.30422","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00117","scoring_system":"epss","scoring_elements":"0.30362","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00117","scoring_system":"epss","scoring_elements":"0.30552","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00117","scoring_system":"epss","scoring_elements":"0.30506","published_at":"2026-04-02T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2021-41165"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-41165","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-41165"},{"reference_url":"https://github.com/ckeditor/ckeditor4","reference_id":"","reference_type":"","scores":[{"value":"8.2","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:L"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/ckeditor/ckeditor4"},{"reference_url":"https://github.com/ckeditor/ckeditor4/blob/major/CHANGES.md#ckeditor-417","reference_id":"","reference_type":"","scores":[{"value":"8.2","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:L"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/ckeditor/ckeditor4/blob/major/CHANGES.md#ckeditor-417"},{"reference_url":"https://www.drupal.org/sa-core-2021-011","reference_id":"","reference_type":"","scores":[{"value":"8.2","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:L"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://www.drupal.org/sa-core-2021-011"},{"reference_url":"https://www.oracle.com/security-alerts/cpuapr2022.html","reference_id":"","reference_type":"","scores":[{"value":"8.2","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:L"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://www.oracle.com/security-alerts/cpuapr2022.html"},{"reference_url":"https://www.oracle.com/security-alerts/cpujan2022.html","reference_id":"","reference_type":"","scores":[{"value":"8.2","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:L"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://www.oracle.com/security-alerts/cpujan2022.html"},{"reference_url":"https://www.oracle.com/security-alerts/cpujul2022.html","reference_id":"","reference_type":"","scores":[{"value":"8.2","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:L"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://www.oracle.com/security-alerts/cpujul2022.html"},{"reference_url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1015217","reference_id":"1015217","reference_type":"","scores":[],"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1015217"},{"reference_url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=999909","reference_id":"999909","reference_type":"","scores":[],"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=999909"},{"reference_url":"https://security.archlinux.org/AVG-2565","reference_id":"AVG-2565","reference_type":"","scores":[{"value":"Medium","scoring_system":"archlinux","scoring_elements":""}],"url":"https://security.archlin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Neutralization of Input During Web Page Generation ('Cross-site Scripting')\nCKEditor4 is an open source WYSIWYG HTML editor. The vulnerability allowed to inject malformed HTML bypassing content sanitization, which could result in executing JavaScript code.","references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2021-41164","reference_id":"","reference_type":"","scores":[{"value":"0.00076","scoring_system":"epss","scoring_elements":"0.22783","published_at":"2026-04-01T12:55:00Z"},{"value":"0.00076","scoring_system":"epss","scoring_elements":"0.22531","published_at":"2026-05-05T12:55:00Z"},{"value":"0.00076","scoring_system":"epss","scoring_elements":"0.22635","published_at":"2026-04-29T12:55:00Z"},{"value":"0.00076","scoring_system":"epss","scoring_elements":"0.22916","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00076","scoring_system":"epss","scoring_elements":"0.22863","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00076","scoring_system":"epss","scoring_elements":"0.22789","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00076","scoring_system":"epss","scoring_elements":"0.22997","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00076","scoring_system":"epss","scoring_elements":"0.22953","published_at":"2026-04-02T12:55:00Z"},{"value":"0.00076","scoring_system":"epss","scoring_elements":"0.2264","published_at":"2026-04-26T12:55:00Z"},{"value":"0.00076","scoring_system":"epss","scoring_elements":"0.22647","published_at":"2026-04-24T12:55:00Z"},{"value":"0.00076","scoring_system":"epss","scoring_elements":"0.22811","published_at":"2026-04-21T12:55:00Z"},{"value":"0.00076","scoring_system":"epss","scoring_elements":"0.22851","published_at":"2026-04-18T12:55:00Z"},{"value":"0.00076","scoring_system":"epss","scoring_elements":"0.22857","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00076","scoring_system":"epss","scoring_elements":"0.22843","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00076","scoring_system":"epss","scoring_elements":"0.229","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00076","scoring_system":"epss","scoring_elements":"0.22936","published_at":"2026-04-11T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2021-41164"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-41164","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-41164"},{"reference_url":"https://github.com/ckeditor/ckeditor4","reference_id":"","reference_type":"","scores":[{"value":"8.2","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:L"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/ckeditor/ckeditor4"},{"reference_url":"https://github.com/ckeditor/ckeditor4/blob/major/CHANGES.md#ckeditor-417","reference_id":"","reference_type":"","scores":[{"value":"8.2","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:L"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/ckeditor/ckeditor4/blob/major/CHANGES.md#ckeditor-417"},{"reference_url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VR76VBN5GW5QUBJFHVXRX36UZ6YTCMW6","reference_id":"","reference_type":"","scores":[{"value":"8.2","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:L"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VR76VBN5GW5QUBJFHVXRX36UZ6YTCMW6"},{"reference_url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VR76VBN5GW5QUBJFHVXRX36UZ6YTCMW6/","reference_id":"","reference_type":"","scores":[],"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VR76VBN5GW5QUBJFHVXRX36UZ6YTCMW6/"},{"reference_url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WOZGMCYDB2OKKULFXZKM6V7JJW4ZZHJP","reference_id":"","reference_type":"","scores":[{"value":"8.2","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:L"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WOZGMCYDB2OKKULFXZKM6V7JJW4ZZHJP"},{"reference_url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WOZGMCYDB2OKKULFXZKM6V7JJW4ZZHJP/","reference_id":"","reference_type":"","scores":[],"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WOZGMCYDB2OKKULFXZKM6V7JJW4ZZHJP/"},{"reference_url":"https://www.drupal.org/sa-core-2021-011","reference_id":"","reference_type":"","scores":[{"value":"8.2","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:L"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://www.drupal.org/sa-core-2021-011"},{"reference_url":"https://ww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4 ReDoS Vulnerability\nIt was possible to execute a ReDoS-type attack inside CKEditor 4 before 4.16 by persuading a victim to paste crafted text into the Styles input of specific dialogs (in the Advanced Tab for Dialogs plugin).","references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2021-26271","reference_id":"","reference_type":"","scores":[{"value":"0.00617","scoring_system":"epss","scoring_elements":"0.69999","published_at":"2026-05-05T12:55:00Z"},{"value":"0.00617","scoring_system":"epss","scoring_elements":"0.69879","published_at":"2026-04-02T12:55:00Z"},{"value":"0.00617","scoring_system":"epss","scoring_elements":"0.69894","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00617","scoring_system":"epss","scoring_elements":"0.69871","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00617","scoring_system":"epss","scoring_elements":"0.69919","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00617","scoring_system":"epss","scoring_elements":"0.69935","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00617","scoring_system":"epss","scoring_elements":"0.69959","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00617","scoring_system":"epss","scoring_elements":"0.69943","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00617","scoring_system":"epss","scoring_elements":"0.69929","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00617","scoring_system":"epss","scoring_elements":"0.69972","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00617","scoring_system":"epss","scoring_elements":"0.69982","published_at":"2026-04-18T12:55:00Z"},{"value":"0.00617","scoring_system":"epss","scoring_elements":"0.69964","published_at":"2026-04-21T12:55:00Z"},{"value":"0.00617","scoring_system":"epss","scoring_elements":"0.70015","published_at":"2026-04-24T12:55:00Z"},{"value":"0.00617","scoring_system":"epss","scoring_elements":"0.70024","published_at":"2026-04-29T12:55:00Z"},{"value":"0.00617","scoring_system":"epss","scoring_elements":"0.69867","published_at":"2026-04-01T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2021-26271"},{"reference_url":"https://ckeditor.com/blog/CKEditor-4.16-with-improved-image-pasting-High-Contrast-support-and-a-new-color-API/#security-comes-first","reference_id":"","reference_type":"","scores":[],"url":"https://ckeditor.com/blog/CKEditor-4.16-with-improved-image-pasting-High-Contrast-support-and-a-new-color-API/#security-comes-first"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26271","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26271"},{"reference_url":"https://github.com/ckeditor/ckeditor4","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/ckeditor/ckeditor4"},{"reference_url":"https://github.com/ckeditor/ckeditor4/blob/major/CHANGES.md#ckeditor-416","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/ckeditor/ckeditor4/blob/major/CHANGES.md#ckeditor-416"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2021-26271","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-26271"},{"reference_url":"https://web.archive.org/web/20210128132707/https://ckeditor.com/blog/CKEditor-4.16-with-improved-image-pasting-High-Contrast-support-and-a-new-color-API/#security-comes-first","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://web.archive.org/web/20210128132707/https://ckeditor.com/blog/CKEditor-4.16-with-improved-image-pasting-High-Contrast-support-and-a-new-color-API/#security-comes-first"},{"reference_url":"https://www.oracle.com//security-alerts/cpujul2021.html","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://www.oracle.com//security-alerts/cpujul2021.html"},{"reference_url":"https://www.oracle.com/security-alerts/cpuoct2021.html","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://www.oracle.com/security-alerts/cpuoct2021.html"},{"reference_url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982587","reference_id":"982587","reference_type":"","scores":[],"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982587"},{"reference_url":"https://github.com/advisories/GHSA-jv4c-7jqq-m34x","reference_id":"GHSA-jv4c-7jqq-m34x","reference_type":"","scores":[{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-jv4c-7jqq-m34x"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/73722?format=json","purl":"pkg:npm/ckeditor4@4.16.0","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-17pr-6guy-53ge"},{"vulnerability":"VCID-4x92-vapt-n7dz"},{"vulnerability":"VCID-8hvk-a5es-v3e4"},{"vulnerability":"VCID-cjwn-p59n-8ygs"},{"vulnerability":"VCID-h8tt-ky69-fuch"},{"vulnerability":"VCID-k7qp-c6vp-sqbg"},{"vulnerability":"VCID-s8u8-xbdk-87dj"},{"vulnerability":"VCID-sd2a-hmu2-wbax"},{"vulnerability":"VCID-un66-k85j-b7d2"},{"vulnerability":"VCID-uw7w-utew-ufb2"},{"vulnerability":"VCID-vc97-xds1-67gu"},{"vulnerability":"VCID-vj35-jtgq-8qbv"},{"vulnerability":"VCID-xhp7-kqdk-tfeu"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:npm/ckeditor4@4.16.0"}],"aliases":["CVE-2021-26271","GHSA-jv4c-7jqq-m34x"],"risk_score":3.1,"exploitability":"0.5","weighted_severity":"6.2","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-c8r2-wpf3-47f9"},{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/15145?format=json","vulnerability_id":"VCID-cjwn-p59n-8ygs","summary":"CKEditor4 Cross-site Scripting vulnerability caused by incorrect CDATA detection\n### Affected packages\nThe vulnerability has been discovered in the core HTML parsing module and may affect all editor instances that:\n* Enabled [full-page editing](https://ckeditor.com/docs/ckeditor4/latest/features/fullpage.html) mode,\n* or enabled [CDATA](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_dtd.html#property-S-cdata) elements in [Advanced Content Filtering](https://ckeditor.com/docs/ckeditor4/latest/guide/dev_advanced_content_filter.html) configuration (defaults to `script` and `style` elements).\n\n### Impact\n\nA potential vulnerability has been discovered in CKEditor 4 HTML processing core module. The vulnerability allowed to inject malformed HTML content bypassing Advanced Content Filtering mechanism, which could result in executing JavaScript code. An attacker could abuse faulty CDATA content detection and use it to prepare an intentional attack on the editor. It affects all users using the CKEditor 4 at version < 4.24.0-lts.\n\n### Patches\nThe problem has been recognized and patched. The fix will be available in version 4.24.0-lts.\n\n### For more information\nEmail us at [security@cksource.com](mailto:security@cksource.com) if you have any questions or comments about this advisory.\n\n### Acknowledgements\nThe CKEditor 4 team would like to thank [Michal Frýba](https://cz.linkedin.com/in/michal-fryba) from [ALEF NULA](https://www.alefnula.com/) for recognizing and reporting this vulnerability.","references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2024-24815","reference_id":"","reference_type":"","scores":[{"value":"0.00117","scoring_system":"epss","scoring_elements":"0.30418","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00117","scoring_system":"epss","scoring_elements":"0.30345","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00117","scoring_system":"epss","scoring_elements":"0.30329","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00117","scoring_system":"epss","scoring_elements":"0.30376","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00117","scoring_system":"epss","scoring_elements":"0.30421","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00117","scoring_system":"epss","scoring_elements":"0.30468","published_at":"2026-04-02T12:55:00Z"},{"value":"0.00117","scoring_system":"epss","scoring_elements":"0.30514","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00117","scoring_system":"epss","scoring_elements":"0.30325","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00117","scoring_system":"epss","scoring_elements":"0.30384","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00169","scoring_system":"epss","scoring_elements":"0.37687","published_at":"2026-04-29T12:55:00Z"},{"value":"0.00169","scoring_system":"epss","scoring_elements":"0.37804","published_at":"2026-04-24T12:55:00Z"},{"value":"0.00169","scoring_system":"epss","scoring_elements":"0.38019","published_at":"2026-04-21T12:55:00Z"},{"value":"0.00169","scoring_system":"epss","scoring_elements":"0.38082","published_at":"2026-04-18T12:55:00Z"},{"value":"0.00169","scoring_system":"epss","scoring_elements":"0.37573","published_at":"2026-05-05T12:55:00Z"},{"value":"0.00169","scoring_system":"epss","scoring_elements":"0.37781","published_at":"2026-04-26T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2024-24815"},{"reference_url":"https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_dtd.html#property-S-cdata","reference_id":"","reference_type":"","scores":[{"value":"6.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-02-08T16:41:58Z/"}],"url":"https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_dtd.html#property-S-cdata"},{"reference_url":"https://ckeditor.com/docs/ckeditor4/latest/features/fullpage.html","reference_id":"","reference_type":"","scores":[{"value":"6.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-02-08T16:41:58Z/"}],"url":"https://ckeditor.com/docs/ckeditor4/latest/features/fullpage.html"},{"reference_url":"https://ckeditor.com/docs/ckeditor4/latest/guide/dev_advanced_content_filter.html","reference_id":"","reference_type":"","scores":[{"value":"6.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-02-08T16:41:58Z/"}],"url":"https://ckeditor.com/docs/ckeditor4/latest/guide/dev_advanced_content_filter.html"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-24815","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-24815"},{"reference_url":"https://github.com/ckeditor/ckeditor4","reference_id":"","reference_type":"","scores":[{"value":"6.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/ckeditor/ckeditor4"},{"reference_url":"https://github.com/ckeditor/ckeditor4/commit/8ed1a3c93d0ae5f49f4ecff5738ab8a2972194cb","reference_id":"","reference_type":"","scores":[{"value":"6.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-02-08T16:41:58Z/"}],"url":"https://github.com/ckeditor/ckeditor4/commit/8ed1a3c93d0ae5f49f4ecff5738ab8a2972194cb"},{"reference_url":"https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-fq6h-4g8v-qqvm","reference_id":"","reference_type":"","scores":[{"value":"6.1","scoring_system":"cvssv3","scoring_elements":""},{"value":"6.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"MO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of Functionality from Untrusted Control Sphere in CKEditor 4\nIt was possible to execute a ReDoS-type attack inside CKEditor 4 before 4.16 by persuading a victim to paste crafted URL-like text into the editor, and then press Enter or Space (in the Autolink plugin).","references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2021-26272","reference_id":"","reference_type":"","scores":[{"value":"0.00502","scoring_system":"epss","scoring_elements":"0.66014","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00502","scoring_system":"epss","scoring_elements":"0.66064","published_at":"2026-05-05T12:55:00Z"},{"value":"0.00502","scoring_system":"epss","scoring_elements":"0.66086","published_at":"2026-04-29T12:55:00Z"},{"value":"0.00502","scoring_system":"epss","scoring_elements":"0.66088","published_at":"2026-04-26T12:55:00Z"},{"value":"0.00502","scoring_system":"epss","scoring_elements":"0.66077","published_at":"2026-04-24T12:55:00Z"},{"value":"0.00502","scoring_system":"epss","scoring_elements":"0.66056","published_at":"2026-04-21T12:55:00Z"},{"value":"0.00502","scoring_system":"epss","scoring_elements":"0.6603","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00502","scoring_system":"epss","scoring_elements":"0.65985","published_at":"2026-04-02T12:55:00Z"},{"value":"0.00502","scoring_system":"epss","scoring_elements":"0.6598","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00502","scoring_system":"epss","scoring_elements":"0.66068","published_at":"2026-04-18T12:55:00Z"},{"value":"0.00502","scoring_system":"epss","scoring_elements":"0.66054","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00502","scoring_system":"epss","scoring_elements":"0.66018","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00502","scoring_system":"epss","scoring_elements":"0.66049","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00502","scoring_system":"epss","scoring_elements":"0.66061","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00502","scoring_system":"epss","scoring_elements":"0.66042","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00502","scoring_system":"epss","scoring_elements":"0.65943","published_at":"2026-04-01T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2021-26272"},{"reference_url":"https://ckeditor.com/blog/CKEditor-4.16-with-improved-image-pasting-High-Contrast-support-and-a-new-color-API/#security-comes-first","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3","scoring_elements":""},{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://ckeditor.com/blog/CKEditor-4.16-with-improved-image-pasting-High-Contrast-support-and-a-new-color-API/#security-comes-first"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26272","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26272"},{"reference_url":"https://github.com/ckeditor/ckeditor4","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/ckeditor/ckeditor4"},{"reference_url":"https://github.com/ckeditor/ckeditor4/blob/major/CHANGES.md#ckeditor-416","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/ckeditor/ckeditor4/blob/major/CHANGES.md#ckeditor-416"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2021-26272","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-26272"},{"reference_url":"https://www.oracle.com/security-alerts/cpujan2022.html","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://www.oracle.com/security-alerts/cpujan2022.html"},{"reference_url":"https://www.oracle.com//security-alerts/cpujul2021.html","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://www.oracle.com//security-alerts/cpujul2021.html"},{"reference_url":"https://www.oracle.com/security-alerts/cpuoct2021.html","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://www.oracle.com/security-alerts/cpuoct2021.html"},{"reference_url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982587","reference_id":"982587","reference_type":"","scores":[],"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982587"},{"reference_url":"https://github.com/advisories/GHSA-wpvm-wqr4-p7cw","reference_id":"GHSA-wpvm-wqr4-p7cw","reference_type":"","scores":[{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-wpvm-wqr4-p7cw"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/73722?format=json","purl":"pkg:npm/ckeditor4@4.16.0","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-17pr-6guy-53ge"},{"vulnerability":"VCID-4x92-vapt-n7dz"},{"vulnerability":"VCID-8hvk-a5es-v3e4"},{"vulnerability":"VCID-cjwn-p59n-8ygs"},{"vulnerability":"VCID-h8tt-ky69-fuch"},{"vulnerability":"VCID-k7qp-c6vp-sqbg"},{"vulnerability":"VCID-s8u8-xbdk-87dj"},{"vulnerability":"VCID-sd2a-hmu2-wbax"},{"vulnerability":"VCID-un66-k85j-b7d2"},{"vulnerability":"VCID-uw7w-utew-ufb2"},{"vulnerability":"VCID-vc97-xds1-67gu"},{"vulnerability":"VCID-vj35-jtgq-8qbv"},{"vulnerability":"VCID-xhp7-kqdk-tfeu"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:npm/ckeditor4@4.16.0"}],"aliases":["CVE-2021-26272","GHSA-wpvm-wqr4-p7cw"],"risk_score":3.1,"exploitability":"0.5","weighted_severity":"6.2","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-h5zz-wz8f-2uf6"},{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/15241?format=json","vulnerability_id":"VCID-h8tt-ky69-fuch","summary":"CKEditor cross-site scripting vulnerability in AJAX sample\n### Affected packages\nThe vulnerability has been discovered in the AJAX sample available at the `samples/old/ajax.html` file location. All integrators that use that sample in the production code can be affected.\n\n### Impact\n\nA potential vulnerability has been discovered in one of CKEditor's 4 samples that are shipped with production code. The vulnerability allowed to execute JavaScript code by abusing the AJAX sample. It affects all users using the CKEditor 4 at version < 4.24.0-lts where `samples/old/ajax.html` is used in a production environment.\n\n### Patches\nThe problem has been recognized and patched. The fix will be available in version 4.24.0-lts.\n\n### For more information\nEmail us at [security@cksource.com](mailto:security@cksource.com) if you have any questions or comments about this advisory.\n\n### Acknowledgements\nThe CKEditor 4 team would like to thank Rafael Pedrero and INCIBE ([original report](https://www.incibe.es/en/incibe-cert/notices/aviso/cross-site-scripting-vulnerability-cksource-ckeditor)) for recognizing and reporting this vulnerability.","references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2023-4771","reference_id":"","reference_type":"","scores":[{"value":"0.2231","scoring_system":"epss","scoring_elements":"0.95787","published_at":"2026-04-02T12:55:00Z"},{"value":"0.2231","scoring_system":"epss","scoring_elements":"0.95846","published_at":"2026-05-05T12:55:00Z"},{"value":"0.2231","scoring_system":"epss","scoring_elements":"0.95835","published_at":"2026-04-29T12:55:00Z"},{"value":"0.2231","scoring_system":"epss","scoring_elements":"0.95833","published_at":"2026-04-21T12:55:00Z"},{"value":"0.2231","scoring_system":"epss","scoring_elements":"0.9583","published_at":"2026-04-18T12:55:00Z"},{"value":"0.2231","scoring_system":"epss","scoring_elements":"0.95825","published_at":"2026-04-16T12:55:00Z"},{"value":"0.2231","scoring_system":"epss","scoring_elements":"0.95814","published_at":"2026-04-13T12:55:00Z"},{"value":"0.2231","scoring_system":"epss","scoring_elements":"0.95812","published_at":"2026-04-12T12:55:00Z"},{"value":"0.2231","scoring_system":"epss","scoring_elements":"0.95809","published_at":"2026-04-09T12:55:00Z"},{"value":"0.2231","scoring_system":"epss","scoring_elements":"0.95805","published_at":"2026-04-08T12:55:00Z"},{"value":"0.2231","scoring_system":"epss","scoring_elements":"0.95797","published_at":"2026-04-07T12:55:00Z"},{"value":"0.2231","scoring_system":"epss","scoring_elements":"0.95795","published_at":"2026-04-04T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2023-4771"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-4771","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-4771"},{"reference_url":"https://github.com/ckeditor/ckeditor4","reference_id":"","reference_type":"","scores":[{"value":"6.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/ckeditor/ckeditor4"},{"reference_url":"https://github.com/ckeditor/ckeditor4/commit/8ed1a3c93d0ae5f49f4ecff5738ab8a2972194cb","reference_id":"","reference_type":"","scores":[{"value":"6.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/ckeditor/ckeditor4/commit/8ed1a3c93d0ae5f49f4ecff5738ab8a2972194cb"},{"reference_url":"https://github.com/ckeditor/ckeditor4-releases","reference_id":"","reference_type":"","scores":[{"value":"6.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/ckeditor/ckeditor4-releases"},{"reference_url":"https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-wh5w-82f3-wrxh","reference_id":"","reference_type":"","scores":[{"value":"6.1","scoring_system":"cvssv3","scoring_elements":""},{"value":"6.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-wh5w-82f3-wrxh"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2023-4771","reference_id":"","reference_type":"","scores":[{"value":"6.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-4771"},{"reference_url":"https://www.incibe.es/en/incibe-cert/notices/aviso/cross-site-scripting-vulnerability-cksource-ckeditor","reference_id":"","reference_type":"","scores":[{"value":"6.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-10-01T14:50:15Z/"}],"url":"https://www.incibe.es/en/incibe-cert/notices/aviso/cross-site-scripting-vulnerability-cksource-ckeditor"},{"reference_url":"https://github.com/advisories/GHSA-hxjc-9j8v-v9pr","reference_id":"GHSA-hxjc-9j8v-v9pr","reference_type":"","scores":[{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-hxjc-9j8v-v9pr"},{"reference_url":"https://github.com/advisories/GHSA-wh5w-82f3-wrxh","reference_id":"GHSA-wh5w-82f3-wrxh","reference_type":"","scores":[{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-wh5w-82f3-wrxh"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/73722?f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Neutralization of Input During Web Page Generation ('Cross-site Scripting')\nCKEditor4 is an open source what-you-see-is-what-you-get HTML editor. A cross-site scripting vulnerability has been discovered affecting Iframe Dialog and Media Embed packages. The vulnerability may trigger a JavaScript code after fulfilling special conditions: using one of the affected packages on a web page with missing proper Content Security Policy configuration; initializing the editor on an element and using an element other than `