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CKEditor CKEditor 5Cross-site scripting (XSS) in the real-time collaboration package

Risk 17

Severity

2.3

EPSS

0.09%

XSS

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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 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 if you have any questions or comments about this advisory.

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Source: GitHub

First published (updated )

CVE-2025-25299

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CKEditor CKEditor 5Cross-site scripting (XSS) in the real-time collaboration package

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