CKEditor 5 cross-site scripting (XSS) vulnerability in the clipboard package - ckeditor5

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 ckeditor5 package to the latest compatible version. Followings are version details:

• Affected version(s): **>= 44.2.0, < 45.2.2

  >= 46.0.0, < 46.0.3**

• Patched version(s): **45.2.2

  46.0.3**

References

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

Related Issues

• CKEditor 5 cross-site scripting (XSS) vulnerability in the clipboard package - CVE-2025-58064
• CKEditor 5 has Cross-site Scripting (XSS) in the HTML Support package - @ckeditor/ckeditor5-html-support - CVE-2026-28343
• Cross-site scripting (XSS) in the clipboard package - ckeditor5 - CVE-2024-45613
• Cross-site scripting (XSS) in the CKEditor 5 real-time collaboration package - CVE-2025-25299

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Tags:

npm

ckeditor5