CVE-2025-25299

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

Description

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.

Category

2.3
CVSS
Severity: Low
CVSS 4.0 •
EPSS 0.10%
Affected: ckeditor ckeditor5
Published at:
Updated at:

References

Link Tags
https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-j3mm-wmfm-mwvh
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

Frequently Asked Questions

What is the severity of CVE-2025-25299?
CVE-2025-25299 has been scored as a low severity vulnerability.
How to fix CVE-2025-25299?
To fix CVE-2025-25299, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-25299 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-25299 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-25299?
CVE-2025-25299 affects ckeditor ckeditor5.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.