CKEditor 5 cross-site scripting (XSS) vulnerability in the clipboard package

Description

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.

Recommendation

Update the @ckeditor/ckeditor5-clipboard package to the latest compatible version. Followings are version details:

• Affected version(s): **>= 46.0.0, < 46.0.3

  >= 44.2.0, < 45.2.2**

• Patched version(s): **46.0.3

  45.2.2**

References

• GHSA-x9gp-vjh6-3wv6
• CVE-2025-58064
• CWE-79
• CAPEC-310
• OWASP 2021-A3
• OWASP 2021-A6