Vulnerability advisory

GHSA-7h26-63m7-qhf2

HTML comments vulnerability allowing to execute JavaScript code

Published Nov 17, 2021Updated Jul 8, 2026OSV record ↗

Also known as BIT-drupal-2021-41165CVE-2021-41165

Severity

CVSS 3.xCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:L

Affected versions

ckeditor4 npm

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Affected	Fixed in
All versions before 4.17.0	`4.17.0`Advisories →

ckeditor/ckeditor Packagist

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Affected Fixed in

All versions before 4.17.0 4.17.0Advisories →

Also listed as affected (53)

Description

Affected packages

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

Impact

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.

Patches

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

For more information

Email us at security@cksource.com if you have any questions or comments about this advisory.

Acknowledgements

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