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                            CERT-Renater

                Note d'Information No. 2026/VULN910
_____________________________________________________________________

DATE                : 17/09/2026

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S):  Systems running Drupal core versions prior
                             to 10.6.17, 11.3.17, 11.4.7.
  
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https://drupal.org/sa-core-2026-013
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Drupal core - Moderately critical - Third-party libraries -
SA-CORE-2026-013

Project:               Drupal core
Project machine name:  drupal
Date:                  2026-September-16
Security risk: 
Moderately critical 13 ∕ 25 AC:Basic/A:User/CI:Some/II:Some/E:Theoretical/TD:Default
Vulnerability:         Third-party libraries
Affected versions: 
>=10.5.0 <10.6.17 || >=11.0.0 <11.3.17 || >=11.4.0 <11.4.7

Description: 

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 

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+ CERT-RENATER        |    tel : 01-53-94-20-44         +
+ 23/25 Rue Daviel    |    fax : 01-53-94-20-41         +
+ 75013 Paris         |   email:cert@support.renater.fr +
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