High severity vulnerability was found in npm ckeditor4 (npm) .

Affected packages

The vulnerability has been discovered in the core HTML processing module and may affect all plugins used by CKEditor 4.


A potential vulnerability has been discovered in CKEditor 4 HTML processing core module. The vulnerability allowed to inject malformed comments HTML bypassing content sanitization, which could result in executing JavaScript code. It affects all users using the CKEditor 4 at version < 4.17.0.


The problem has been recognized and patched. The fix will be available in version 4.17.0.

The CKEditor 4 team would like to thank William Bowling (wbowling) for recognizing and reporting this vulnerability.



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