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    CVE-2021-33829

    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.

    Published:Jun 9, 2021
    Last Modified:Nov 21, 2024
    EPS:Jun 9, 2021
    EPSS Score:0.00735
    CVSS Score:6.1

    Affected Products

    Vendor
    Ckeditor
    Product
    Ckeditor
    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Drupal
    Product
    Drupal
    Vendor
    Fedoraproject
    Product
    Fedora

    Exploits

    No exploit reference

    Related CVEs

    CVE-2025-13980 (CVSS 5.3) — Authentication Bypass Using an Alternate Path or Channel vulnerability in Drupal CKEditor 5 Premium Features a…
    CVE-2024-43407 (CVSS 6.1) — CKEditor4 is an open source what-you-see-is-what-you-get HTML editor. A potential vulnerability has been disco…
    CVE-2024-24816 (CVSS 6.1) — CKEditor4 is an open source what-you-see-is-what-you-get HTML editor. A cross-site scripting vulnerability vul…
    CVE-2024-24815 (CVSS 6.1) — CKEditor4 is an open source what-you-see-is-what-you-get HTML editor. A cross-site scripting vulnerability has…
    CVE-2023-31541 (CVSS 9.8) — A unrestricted file upload vulnerability was discovered in the ‘Browse and upload images’ feature of the CKEdi…
    CVE-2023-28439 (CVSS 4.7) — CKEditor4 is an open source what-you-see-is-what-you-get HTML editor. A cross-site scripting vulnerability has…
    CVE-2022-48110 (CVSS 6.1) — CKSource CKEditor 5 35.4.0 was discovered to contain a cross-site scripting (XSS) vulnerability via the Full F…
    CVE-2022-24728 (CVSS 5.4) — CKEditor4 is an open source what-you-see-is-what-you-get HTML editor. A vulnerability has been discovered in t…
    CVE-2022-24729 (CVSS 6.5) — CKEditor4 is an open source what-you-see-is-what-you-get HTML editor. CKEditor4 prior to version 4.18.0 contai…
    CVE-2021-41165 (CVSS 8.2) — CKEditor4 is an open source WYSIWYG HTML editor. In affected version a vulnerability has been discovered in th…

    References

    https://ckeditor.com/blog/ckeditor-4.16.1-with-accessibility-enhancements/#improvements-for-comments-in-html-parser
    https://lists.debian.org/debian-lts-announce/2021/11/msg00007.html
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NYA354LJP47KCVJMTUO77ZCX3ZK42G3T/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UVOYN2WKDPLKCNILIGEZM236ABQASLGW/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WAGNWHFIQAVCP537KFFS2A2GDG66J7XD/
    https://www.drupal.org/sa-core-2021-003
    https://ckeditor.com/blog/ckeditor-4.16.1-with-accessibility-enhancements/#improvements-for-comments-in-html-parser
    https://lists.debian.org/debian-lts-announce/2021/11/msg00007.html
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NYA354LJP47KCVJMTUO77ZCX3ZK42G3T/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UVOYN2WKDPLKCNILIGEZM236ABQASLGW/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WAGNWHFIQAVCP537KFFS2A2GDG66J7XD/
    https://www.drupal.org/sa-core-2021-003

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High