CVE-2024-24815: CKEditor4 Cross-site scripting (XSS) vulnerability caused by incorrect CDATA detection
Affected packages The vulnerability has been discovered in the core HTML parsing module and may affect all editor instances that: Enabled full-page editing mode, or enabled CDATA elements in Advanced Content Filtering configuration (defaults to script and style elements).
Impact
A 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.
Patches The problem has been recognized and patched. The fix will be available in version 4.24.0-lts.
For more information Email us at security@cksource.com if you have any questions or comments about this advisory.
Acknowledgements The CKEditor 4 team would like to thank Michal Frýba from ALEF NULA for recognizing and reporting this vulnerability.
Other sources
CKEditor4 is an open source what-you-see-is-what-you-get HTML editor. A cross-site scripting vulnerability has been discovered in the core HTML parsing module in versions of CKEditor4 prior to 4.24.0-lts. It may affect all editor instances that enabled full-page editing mode or enabled CDATA elements in Advanced Content Filtering configuration (defaults to script and style elements). The vulnerability allows attackers 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. A fix is available in version 4.24.0-lts.
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Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2024-24815?
CVE-2024-24815 is classified as a moderate severity vulnerability affecting the core HTML parsing module of CKEditor.
How do I fix CVE-2024-24815?
To fix CVE-2024-24815, you should upgrade to CKEditor version 4.24.0 or later.
Which software versions are affected by CVE-2024-24815?
CVE-2024-24815 affects CKEditor versions prior to 4.24.0 and 4.24.0-lts.
What features of CKEditor are impacted by CVE-2024-24815?
CVE-2024-24815 impacts CKEditor instances that have enabled full-page editing or CDATA mode.
Is there a workaround for CVE-2024-24815 if I can't upgrade?
Currently, the best approach to mitigate CVE-2024-24815 is to disable full-page editing and CDATA mode until an upgrade can be completed.