CVE-2025-25299 Details
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.
A cross-site scripting (XSS) vulnerability has been identified in the CKEditor 5 real-time collaboration package, affecting versions 41.3.0 prior to 44.2.0, as well as CKEditor 5 collaboration features in the premium version. The vulnerability arises within user markers, which indicate users' positions in the document, and can lead to unauthorized execution of JavaScript code. This issue is present only in installations with real-time collaborative editing enabled, and exploitation may require a specific configuration of the editor and token endpoint.
Users are advised to upgrade to CKEditor 5 version 44.2.1 or later, where this vulnerability has been patched. Instructions for updating can be found in the CKEditor 5 documentation.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Feb 20, 2025CISA-ADP
Assessed Feb 20, 2025References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | [email protected] |
| CWE-80 | Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| CKEditor 5 | >= 41.3.0, <= 44.2.0 (semver) >= 42.0.0, <= 44.2.0 (semver) |
CPE
Remediation
| |
| @ckeditor/ckeditor5-real-time-collaboration | All versions |
CPE
Remediation
| |
| @ckeditor/ckeditor5-premium-features | All versions |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Feb 20, 2025 | New CVE Received | [email protected] |