CVE-2025-58064: CKEditor 5 cross-site scripting (XSS) vulnerability in the clipboard package

September 3, 2025

A Cross-Site Scripting (XSS) vulnerability has been discovered in the CKEditor 5 clipboard package. This vulnerability could be triggered by a specific user action, leading to unauthorized JavaScript code execution, if the attacker managed to insert a malicious content into the editor, which might happen with a very specific editor configuration.

References

github.com/advisories/GHSA-x9gp-vjh6-3wv6
github.com/ckeditor/ckeditor5
github.com/ckeditor/ckeditor5/commit/b210e90c6cf84e662ef6c7daf93a92355a961bf2
github.com/ckeditor/ckeditor5/security/advisories/GHSA-x9gp-vjh6-3wv6
nvd.nist.gov/vuln/detail/CVE-2025-58064

Code Behaviors & Features

Detect and mitigate CVE-2025-58064 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →