CVE-2025-25299: Cross-site scripting (XSS) in the real-time collaboration package
First published: Thu Feb 20 2025(Updated: )
### 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 [security@cksource.com](mailto:security@cksource.com) if you have any questions or comments about this advisory.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| CKEditor 5 | <44.2.1 | |
| npm/ckeditor5-premium-features | >=42.0.0<44.2.0 | 44.2.1 |
| npm/@ckeditor/ckeditor5-real-time-collaboration | >=41.3.0<=44.2.0 | 44.2.1 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- 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
- https://ckeditor.com/docs/ckeditor5/latest/features/collaboration/real-time-collaboration/real-time-collaboration.html?docId=ee1dca024c9b4e44aef039f99ebe6c664
- https://nvd.nist.gov/vuln/detail/CVE-2025-25299
- https://github.com/advisories/GHSA-j3mm-wmfm-mwvh (Advisory)
Frequently Asked Questions
What is the severity of CVE-2025-25299?
CVE-2025-25299 is classified as a high-severity Cross-Site Scripting (XSS) vulnerability in CKEditor 5.
How do I fix CVE-2025-25299?
To fix CVE-2025-25299, update CKEditor 5 to version 44.2.1 or later.
Which versions of CKEditor 5 are affected by CVE-2025-25299?
CVE-2025-25299 affects versions of CKEditor 5 prior to 44.2.1.
What is the impact of CVE-2025-25299 on users?
CVE-2025-25299 can allow an attacker to execute arbitrary JavaScript in the context of the affected user's session.
Is CVE-2025-25299 related to real-time collaboration features?
Yes, CVE-2025-25299 specifically affects the real-time collaboration package in CKEditor 5.
- agent/weakness
- agent/title
- agent/first-publish-date
- agent/type
- agent/guess-ai
- agent/software-canonical-lookup
- agent/software-canonical-lookup-request
- agent/softwarecombine
- agent/description
- collector/github-advisory-latest
- source/GitHub
- alias/GHSA-j3mm-wmfm-mwvh
- alias/CVE-2025-25299
- agent/references
- agent/last-modified-date
- collector/nvd-cve
- source/NVD
- agent/author
- agent/severity
- agent/event
- collector/nvd-api
- agent/source
- agent/tags
- collector/mitre-cve
- source/MITRE
- collector/epss-latest
- source/FIRST
- agent/epss
- collector/github-advisory
- vendor/ckeditor
- canonical/ckeditor 5
- package-manager/npm