CKEditor HTML comments vulnerability allowing to execute JavaScript code [CVE-2021-41165]

CVE number = CVE-2021-41165

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.

Duncan Newell

Duncan is a technology professional with over 20 years experience of working in various IT roles. He has a interest in cyber security, and has a wide range of other skills in radio, electronics and telecommunications.

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