CVE-2025-25299

Cross-site scripting (XSS) in the real-time collaboration package

CVSS 2.3 LOWEPSS 0.6%CWE-79 CWE-80

Vexday Risk Score

8Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 2.3EPSS 0.6%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

20 Feb 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

CKEditor 5 is a modern JavaScript rich-text editor with an MVC architecture. During a recent internal audit, a Cross-Site Scripting (XSS) vulnerability was discovered in the CKEditor 5 real-time collaboration package. This vulnerability affects user markers, which represent users' positions within the document. It can lead to unauthorized JavaScript code execution, which might happen with a very specific editor and token endpoint configuration. This vulnerability affects only installations with Real-time collaborative editing enabled. The problem has been recognized and patched. The fix is available in version 44.2.1 (and above). Users are advised to upgrade. There are no known workarounds for this vulnerability.

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

Affected products

ckeditor · ckeditor5

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References

https://ckeditor.com/docs/ckeditor5/latest/features/collaboration/real-time-collaboration/real-time-collaboration.html https://github.com/ckeditor/ckeditor5/releases/tag/v44.2.1 https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-j3mm-wmfm-mwvh