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Vulnerability details: VCID-8hvk-a5es-v3e4
Vulnerability ID VCID-8hvk-a5es-v3e4
Aliases CVE-2021-41164
GHSA-pvmx-g8h5-cprj
Summary Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') CKEditor4 is an open source WYSIWYG HTML editor. The vulnerability allowed to inject malformed HTML bypassing content sanitization, which could result in executing JavaScript code.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00076 https://api.first.org/data/v1/epss?cve=CVE-2021-41164
epss 0.00076 https://api.first.org/data/v1/epss?cve=CVE-2021-41164
epss 0.00076 https://api.first.org/data/v1/epss?cve=CVE-2021-41164
epss 0.00076 https://api.first.org/data/v1/epss?cve=CVE-2021-41164
epss 0.00076 https://api.first.org/data/v1/epss?cve=CVE-2021-41164
epss 0.00076 https://api.first.org/data/v1/epss?cve=CVE-2021-41164
epss 0.00076 https://api.first.org/data/v1/epss?cve=CVE-2021-41164
epss 0.00076 https://api.first.org/data/v1/epss?cve=CVE-2021-41164
epss 0.00076 https://api.first.org/data/v1/epss?cve=CVE-2021-41164
cvssv3.1_qr HIGH https://github.com/advisories/GHSA-pvmx-g8h5-cprj
cvssv3.1 8.2 https://github.com/ckeditor/ckeditor4
generic_textual HIGH https://github.com/ckeditor/ckeditor4
cvssv3.1 8.2 https://github.com/ckeditor/ckeditor4/blob/major/CHANGES.md#ckeditor-417
generic_textual HIGH https://github.com/ckeditor/ckeditor4/blob/major/CHANGES.md#ckeditor-417
cvssv3 8.2 https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-pvmx-g8h5-cprj
cvssv3.1 8.2 https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-pvmx-g8h5-cprj
cvssv3.1_qr HIGH https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-pvmx-g8h5-cprj
generic_textual HIGH https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-pvmx-g8h5-cprj
cvssv3.1 8.2 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VR76VBN5GW5QUBJFHVXRX36UZ6YTCMW6
generic_textual HIGH https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VR76VBN5GW5QUBJFHVXRX36UZ6YTCMW6
cvssv3.1 8.2 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WOZGMCYDB2OKKULFXZKM6V7JJW4ZZHJP
generic_textual HIGH https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WOZGMCYDB2OKKULFXZKM6V7JJW4ZZHJP
cvssv3.1 8.2 https://nvd.nist.gov/vuln/detail/CVE-2021-41164
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2021-41164
archlinux Medium https://security.archlinux.org/AVG-2565
cvssv3.1 8.2 https://www.drupal.org/sa-core-2021-011
generic_textual HIGH https://www.drupal.org/sa-core-2021-011
cvssv3.1 8.2 https://www.oracle.com/security-alerts/cpuapr2022.html
generic_textual HIGH https://www.oracle.com/security-alerts/cpuapr2022.html
cvssv3.1 8.2 https://www.oracle.com/security-alerts/cpujan2022.html
generic_textual HIGH https://www.oracle.com/security-alerts/cpujan2022.html
cvssv3.1 8.2 https://www.oracle.com/security-alerts/cpujul2022.html
generic_textual HIGH https://www.oracle.com/security-alerts/cpujul2022.html
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-41164
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-41164
https://github.com/ckeditor/ckeditor4
https://github.com/ckeditor/ckeditor4/blob/major/CHANGES.md#ckeditor-417
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VR76VBN5GW5QUBJFHVXRX36UZ6YTCMW6
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VR76VBN5GW5QUBJFHVXRX36UZ6YTCMW6/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WOZGMCYDB2OKKULFXZKM6V7JJW4ZZHJP
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WOZGMCYDB2OKKULFXZKM6V7JJW4ZZHJP/
https://www.drupal.org/sa-core-2021-011
https://www.oracle.com/security-alerts/cpuapr2022.html
https://www.oracle.com/security-alerts/cpujan2022.html
https://www.oracle.com/security-alerts/cpujul2022.html
999909 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=999909
AVG-2565 https://security.archlinux.org/AVG-2565
CVE-2021-41164 https://nvd.nist.gov/vuln/detail/CVE-2021-41164
GHSA-pvmx-g8h5-cprj https://github.com/advisories/GHSA-pvmx-g8h5-cprj
GHSA-pvmx-g8h5-cprj https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-pvmx-g8h5-cprj
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:L Found at https://github.com/ckeditor/ckeditor4
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:L Found at https://github.com/ckeditor/ckeditor4/blob/major/CHANGES.md#ckeditor-417
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:L Found at https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-pvmx-g8h5-cprj
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:L Found at https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VR76VBN5GW5QUBJFHVXRX36UZ6YTCMW6
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:L Found at https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WOZGMCYDB2OKKULFXZKM6V7JJW4ZZHJP
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:L Found at https://nvd.nist.gov/vuln/detail/CVE-2021-41164
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:L Found at https://www.drupal.org/sa-core-2021-011
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:L Found at https://www.oracle.com/security-alerts/cpuapr2022.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:L Found at https://www.oracle.com/security-alerts/cpujan2022.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:L Found at https://www.oracle.com/security-alerts/cpujul2022.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.22783
EPSS Score 0.00076
Published At April 1, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T12:49:04.936405+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/npm/ckeditor4/CVE-2021-41164.yml 38.0.0