GHSA-j3mm-wmfm-mwvh
Cross-site scripting (XSS) in the CKEditor 5 real-time collaboration package
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | @ckeditor/ckeditor5-real-time-collaboration | >= 41.3.0, < 44.2.1 | 44.2.1 |
| npm | ckeditor5-premium-features | >= 42.0.0, < 44.2.1 | 44.2.1 |
Details
As written in the advisory (Markdown source, shown as plain text).
### Impact
During a recent internal audit, we identified a Cross-Site Scripting (XSS) vulnerability in the CKEditor 5 real-time collaboration package. This vulnerability can lead to unauthorized JavaScript code execution and affects user markers, which represent users' positions within the document.
This vulnerability affects only installations with [Real-time collaborative editing](https://ckeditor.com/docs/ckeditor5/latest/features/collaboration/real-time-collaboration/real-time-collaboration.html) enabled.
### Patches
The problem has been recognized and patched. The fix will be available in version 44.2.1 (and above).
### For more information
Email us at [[email protected]](mailto:[email protected]) if you have any questions or comments about this advisory.
References
External links from the advisory. They lead to third-party sites.
- https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-j3mm-wmfm-mwvh
- https://nvd.nist.gov/vuln/detail/CVE-2025-25299
- https://ckeditor.com/docs/ckeditor5/latest/features/collaboration/real-time-collaboration/real-time-collaboration.html
- https://ckeditor.com/docs/ckeditor5/latest/features/collaboration/real-time-collaboration/real-time-collaboration.html?docId=ee1dca024c9b4e4…
- https://github.com/ckeditor/ckeditor5
- https://github.com/ckeditor/ckeditor5/releases/tag/v44.2.1