Software Update: Drupal 8.9.20 / 9.1.14 / 9.2.9

Updates have been released for Drupal versions 8.9, 9.1 and 9.2. Drupal is a PHP-written, user-friendly and powerful content management platform, with which, for example, websites can be created. It’s simple enough for a novice user, but powerful enough to build a more complex website as well. The program includes a content management platform and a development framework. The updates contain a fix for five security vulnerabilities.

Drupal core – Moderately critical – Cross Site Scripting – SA-CORE-2021-011

• Project: Drupal core
• Date: 2021-November-17
• security risk: Moderately critical 13∕25 AC:Basic/A:User/CI:Some/II:Some/E:Theoretical/TD:Default
• Vulnerability: Cross Site Scripting
• Description: The Drupal project uses the CKEditor library for WYSIWYG editing. CKEditor has released a security update that impacts Drupalalong with a hotfix for that update†

Vulnerabilities are possible if Drupal is configured to allow use of the CKEditor library for WYSIWYG editing. An attacker that can create or edit content (even without access to CKEditor themselves) may be able to exploit one or more Cross-Site Scripting (XSS) vulnerabilities to target users with access to the WYSIWYG CKEditor, including site admins with privileged access. For more information, see CKEditor’s security advisories:

• CVE-2021-41165: HTML comments vulnerability allowing to execute JavaScript code
• CVE-2021-41164: Advanced Content Filter (ACF) vulnerability allowing to execute JavaScript code using malformed HTML

This advisory is not covered by Drupal Flight Attendant†

Solution: Install the latest version:

• If you are using Drupal 9.2, update to Drupal 9.2.9†
• If you are using Drupal 9.1, update to Drupal 9.1.14†
• If you are using Drupal 8.9, update to Drupal 8.9.20†

Versions of Drupal prior to 9.1.x are end-of-life and do not receive security coverage.