CVE-2025-25299
Cross-site scripting (XSS) in the CKEditor 5 real-time collaboration package
Description
### 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.
How to fix CVE-2025-25299
To remediate CVE-2025-25299, upgrade the affected package to a fixed version below.
- —upgrade to 44.2.1 or later
- —upgrade to 44.2.1 or later
Is CVE-2025-25299 being exploited?
Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- >= 42.0.0, < 44.2.1
- >= 41.3.0, < 44.2.1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N |