CVE-2026-28343

CKEditor 5 is a modern JavaScript rich-text editor with an MVC architecture. Starting in version 29.0.0 and prior to version 47.6.0, a cross-site scripting (XSS) vulnerability has been discovered in the General HTML Support feature. This vulnerability could be triggered by inserting specially crafted markup, leading to unauthorized JavaScript code execution, if the editor instance used an unsafe General HTML Support configuration. This issue has been patched in version 47.6.0.

• CWE-79

• https://github.com/ckeditor/ckeditor5/releases/tag/v29.0.0
• https://github.com/ckeditor/ckeditor5/releases/tag/v47.6.0Release Notes
• https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-jrqm-vmqc-gm93Mitigation, Vendor Advisory

Published

Mar 5, 2026

Last Modified

Jun 17, 2026

Status

Modified

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