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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 `<textarea>` as a base; and destroying the editor instance. This vulnerability might affect a small percentage of integrators that depend on dynamic editor initialization/destroy mechanism. A fix is available in CKEditor4 version 4.21.0. In some rare cases, a security fix may be considered a breaking change. Starting from version 4.21.0, the Iframe Dialog plugin applies the `sandbox` attribute by default, which restricts JavaScript code execution in the iframe element. To change this behavior, configure the `config.iframe_attributes` option. Also starting from version 4.21.0, the Media Embed plugin regenerates the entire content of the embed widget by default. To change this behavior, configure the `config.embed_keepOriginalContent` option. Those who choose to enable either of the more permissive options or who cannot upgrade to a patched version should properly configure Content Security Policy to avoid any potential security issues that may arise from embedding iframe elements on their web page.","references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2023-28439","reference_id":"","reference_type":"","scores":[{"value":"0.0031","scoring_system":"epss","scoring_elements":"0.54139","published_at":"2026-04-04T12:55:00Z"},{"value":"0.0031","scoring_system":"epss","scoring_elements":"0.5411","published_at":"2026-04-02T12:55:00Z"},{"value":"0.0031","scoring_system":"epss","scoring_elements":"0.54166","published_at":"2026-04-08T12:55:00Z"},{"value":"0.0031","scoring_system":"epss","scoring_elements":"0.54115","published_at":"2026-04-07T12:55:00Z"},{"value":"0.0036","scoring_system":"epss","scoring_elements":"0.58221","published_at":"2026-04-09T12:55:00Z"},{"value":"0.0036","scoring_system":"epss","scoring_elements":"0.58238","published_at":"2026-04-11T12:55:00Z"},{"value":"0.0036","scoring_system":"epss","scoring_elements":"0.58214","published_at":"2026-04-12T12:55:00Z"},{"value":"0.0036","scoring_system":"epss","scoring_elements":"0.58194","published_at":"2026-04-13T12:55:00Z"},{"value":"0.0036","scoring_system":"epss","scoring_elements":"0.58226","published_at":"2026-04-16T12:55:00Z"},{"value":"0.0036","scoring_system":"epss","scoring_elements":"0.58229","published_at":"2026-04-18T12:55:00Z"},{"value":"0.0036","scoring_system":"epss","scoring_elements":"0.58204","published_at":"2026-04-21T12:55:00Z"},{"value":"0.0036","scoring_system":"epss","scoring_elements":"0.58169","published_at":"2026-04-29T12:55:00Z"},{"value":"0.0036","scoring_system":"epss","scoring_elements":"0.58183","published_at":"2026-04-26T12:55:00Z"},{"value":"0.0036","scoring_system":"epss","scoring_elements":"0.58131","published_at":"2026-05-05T12:55:00Z"},{"value":"0.0036","scoring_system":"epss","scoring_elements":"0.58174","published_at":"2026-05-07T12:55:00Z"},{"value":"0.0036","scoring_system":"epss","scoring_elements":"0.58235","published_at":"2026-05-09T12:55:00Z"},{"value":"0.0036","scoring_system":"epss","scoring_elements":"0.58186","published_at":"2026-05-11T12:55:00Z"},{"value":"0.0036","scoring_system":"epss","scoring_elements":"0.58215","published_at":"2026-05-12T12:55:00Z"},{"value":"0.0054","scoring_system":"epss","scoring_elements":"0.67795","published_at":"2026-05-14T12:55:00Z"},{"value":"0.0054","scoring_system":"epss","scoring_elements":"0.67808","published_at":"2026-05-15T12:55:00Z"},{"value":"0.0054","scoring_system":"epss","scoring_elements":"0.67822","published_at":"2026-05-16T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2023-28439"},{"reference_url":"https://ckeditor.com/cke4/addon/embed","reference_id":"","reference_type":"","scores":[{"value":"4.7","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-10-15T17:09:11Z/"}],"url":"https://ckeditor.com/cke4/addon/embed"},{"reference_url":"https://ckeditor.com/cke4/addon/iframe","reference_id":"","reference_type":"","scores":[{"value":"4.7","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-10-15T17:09:11Z/"}],"url":"https://ckeditor.com/cke4/addon/iframe"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-28439","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-28439"},{"reference_url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1034481","reference_id":"1034481","reference_type":"","scores":[],"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1034481"},{"reference_url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1059301","reference_id":"1059301","reference_type":"","scores":[],"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1059301"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2023-28439","reference_id":"CVE-2023-28439","reference_type":"","scores":[],"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-28439"},{"reference_url":"https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-vh5c-xwqv-cv9g","reference_id":"GHSA-vh5c-xwqv-cv9g","reference_type":"","scores":[{"value":"4.7","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-10-15T17:09:11Z/"}],"url":"https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-vh5c-xwqv-cv9g"},{"reference_url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GWKG2VCPJNETVCDTXU4X6FQ2PO6XCNGN/","reference_id":"GWKG2VCPJNETVCDTXU4X6FQ2PO6XCNGN","reference_type":"","scores":[{"value":"4.7","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-10-1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