Project: Drupal coreProject machine name: drupalDate: 2026-September-16Security risk: Moderately critical 13 ∕ 25 AC:Basic/A:User/CI:Some/II:Some/E:Theoretical/TD:DefaultVulnerability: Third-party librariesAffected versions: >=10.5.0 <10.6.17 || >=11.0.0 <11.3.17 || >=11.4.0 <11.4.7Description: 

The Drupal project uses the CKEditor library for WYSIWYG editing. CKEditor has released a security update that impacts Drupal.

Vulnerabilities are possible if Drupal is configured to use CKEditor for WYSIWYG editing. An attacker that can create or edit content (even without access to CKEditor themselves) may be able to exploit this Cross-Site Scripting (XSS) vulnerability to target users with access to the WYSIWYG CKEditor, including site admins with privileged access.

For more information, see CKEditor's security advisory:

• High-severity Cross-site scripting (XSS) in the engine package

Solution: 

Install the latest version:

Drupal 11

• If you use Drupal 11.4.x, update to Drupal 11.4.7.
• If you use Drupal 11.3.x, update to Drupal 11.3.17.
• Drupal 11.2.x and below are end-of-life and do not receive security coverage.

Drupal 10

• If you use Drupal 10.6.x, update to Drupal 10.6.17.
• Drupal 10.5.x and below are end-of-life and do not receive security coverage.

Note that Drupal 8 and Drupal 9 have both reached end-of-life.

Instructions for contributed modules

Site owners should also review their site following the protocol for managing external libraries and plugins, as contributed projects may use additional CKEditor plugins not packaged in Drupal core.

CKEditor has also released another CVE in today's release that does not affect Drupal, but may affect custom plugins or other usecases:

• Low-severity Cross-site scripting (XSS) in the engine package

Reported By: 

• Piotrek Koszuliński (Reinmar)

Fixed By: 

• catch (catch) of the Drupal Security Team
• Lee Rowlands (larowlan) of the Drupal Security Team
• Mohit Aghera (mohit_aghera), provisional member of the Drupal Security Team
• Jess (xjm) of the Drupal Security Team

Coordinated By: 

• Bram Driesen (bramdriesen) of the Drupal Security Team
• catch (catch) of the Drupal Security Team
• Greg Knaddison (greggles) of the Drupal Security Team
• Lee Rowlands (larowlan) of the Drupal Security Team
• Dave Long (longwave) of the Drupal Security Team
• Jess (xjm) of the Drupal Security Team