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.
References (3)
Scores
CVSS v4
2.3
EPSS
0.0035
EPSS Percentile
57.3%
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
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-79
CWE-80
Status
published
Products (4)
ckeditor/ckeditor5
@ckeditor/ckeditor5-real-time-collaboration: >= 41.3.0, < 44.2.1
ckeditor/ckeditor5
ckeditor5-premium-features: >= 42.0.0, < 44.2.1
ckeditor/ckeditor5-real-time-collaboration
41.3.0 - 44.2.1npm
npm/ckeditor5-premium-features
42.0.0 - 44.2.1npm
Published
Feb 20, 2025
Tracked Since
Feb 18, 2026