CKEditor 5 cross-site scripting (XSS) vulnerability in the clipboard package
Date: 2025-09
Affected: npm/@ckeditor/ckeditor5-clipboard, npm/ckeditor5, npm/@ckeditor/ckeditor5-clipboard
Attack vector: xss
Category: vulnerability-disclosure
Severity: Low
CVE: CVE-2025-58064
CWE: CWE-79

### Impact A Cross-Site Scripting (XSS) vulnerability has been discovered in the CKEditor 5 clipboard package. This vulnerability could be triggered by a specific user action, leading to unauthorized JavaScript code execution, if the attacker managed to insert a malicious content into the editor, which might happen with a very specific editor configuration. This vulnerability affects **only** installations where the editor configuration meets one of the following criteria: - [HTML embed plugin](https://ckeditor.com/docs/ckeditor5/latest/features/html/html-embed.html) is enabled - Custom plugin introducing editable element which implements view [`RawElement`](https://ckeditor.com/docs/ckeditor5/latest/api/module_engine_view_rawelement-ViewRawElement.html) is enabled ### Patches The problem has been recognized and patched. The fix will be available in version 46.0.3 (and above), and explicitly in version 45.2.2. ### For more information Email us at [security@cksource.com](mailto:security@cksource.com) if you have any questions or comments about this advisory.


Mitigations:

Architectural layers (MAESTRO):