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Vulnerability record · CVE-2021-41165 · published 17 November 2021

CVE-2021-41165: Ckeditor cross-site scripting vulnerability

Ckeditor · Ckeditor

CKEditor4 is an open source WYSIWYG HTML editor. In affected version a vulnerability has been discovered in the core HTML processing module and may affect all plugins used by CKEditor 4. 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.

5.4 CVSS 3.1 Medium EPSS 1.6% · top 25.6% CWE-79 · Cross-site scripting
5.4CVSS 3.1 base score, v2 3.5
1.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
9Affected product versions listed by NVD
12References
17 Jun 2026Last modified by NVD

Description

CKEditor4 is an open source WYSIWYG HTML editor. In affected version a vulnerability has been discovered in the core HTML processing module and may affect all plugins used by CKEditor 4. 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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Affected products

9 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/ckeditor/ckeditor4/blob/major/CHANGES.md#ckeditor-417 Third Party Advisory
https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-7h26-63m7-qhf2 Third Party Advisory
https://www.drupal.org/sa-core-2021-011 Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html PatchThird Party Advisory
https://www.oracle.com/security-alerts/cpujan2022.html PatchThird Party Advisory
https://www.oracle.com/security-alerts/cpujul2022.html Not Applicable
https://github.com/ckeditor/ckeditor4/blob/major/CHANGES.md#ckeditor-417 Third Party Advisory
https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-7h26-63m7-qhf2 Third Party Advisory
https://www.drupal.org/sa-core-2021-011 Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html PatchThird Party Advisory
https://www.oracle.com/security-alerts/cpujan2022.html PatchThird Party Advisory
https://www.oracle.com/security-alerts/cpujul2022.html Not Applicable

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Source: NIST National Vulnerability Database (record CVE-2021-41165), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.