GHSA-v6mg-96c6-gmpqLowCVSS 3.1

CKEditor: Cross-site scripting (XSS) in the engine package

Published
October 27, 2026
Last Modified
October 27, 2026

🔗 CVE IDs covered (1)

📋 Description

Impact

A Cross-Site Scripting (XSS) vulnerability has been discovered in the CKEditor 5 engine. This vulnerability could be triggered by inserting specially crafted markup under a specific General HTML Support configuration that allows inserting objects, leading to unauthorized JavaScript code execution in a browser context isolated from the origin of the application embedding the editor.

This vulnerability affects only installations where General HTML Support is enabled and configured to allow the affected HTML content.

Patches

The problem has been recognized and patched. The fix will be available in version 48.5.1 (and above) and 47.7.4 (LTS).

For more information

Email us at [email protected] if you have any questions or comments about this advisory.

🎯 Affected products4

  • npm/ckeditor5:>= 29.0.0, < 47.7.4
  • npm/@ckeditor/ckeditor5-engine:>= 29.0.0, < 47.7.4
  • npm/ckeditor5:>= 48.0.0, < 48.5.1
  • npm/@ckeditor/ckeditor5-engine:>= 48.0.0, < 48.5.1

🔗 References (6)