ADVISORIES

• CVE-2021-33829 (NVD)
• GHSA-rgx6-rjj4-c388
• Vendor Advisory

GEM

ckeditor

SEVERITY

CVSS v3.x: 6.1 (Medium)

UNAFFECTED VERSIONS

• < 5.1.1

PATCHED VERSIONS

• >= 5.1.2

DESCRIPTION

A cross-site scripting (XSS) vulnerability in the HTML Data Processor in CKEditor 4 4.14.0 through 4.16.x before 4.16.1 allows remote attackers to inject executable JavaScript code through a crafted comment because --!> is mishandled.

RELATED

• https://nvd.nist.gov/vuln/detail/CVE-2021-33829
• https://ckeditor.com/blog/ckeditor-4.16.1-with-accessibility-enhancements/#improvements-for-comments-in-html-parser
• https://www.npmjs.com/package/ckeditor4
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NYA354LJP47KCVJMTUO77ZCX3ZK42G3T/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UVOYN2WKDPLKCNILIGEZM236ABQASLGW/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WAGNWHFIQAVCP537KFFS2A2GDG66J7XD/
• https://www.drupal.org/sa-core-2021-003
• https://lists.debian.org/debian-lts-announce/2021/11/msg00007.html
• https://github.com/FriendsOfPHP/security-advisories/blob/master/drupal/core/CVE-2021-33829.yaml
• https://github.com/FriendsOfPHP/security-advisories/blob/master/drupal/drupal/CVE-2021-33829.yaml
• https://github.com/advisories/GHSA-rgx6-rjj4-c388