Combined image style - Moderately critical - Improper access control - SA-CONTRIB-2026-188

Project: Combined image styleProject machine name: combined_image_styleDate: 2026-September-23Security risk: Moderately critical 10 ∕ 25 AC:Basic/A:None/CI:None/II:None/E:Theoretical/TD:AllVulnerability: Improper access controlAffected versions: <1.0.7CVE IDs: CVE-2026-96377Description: This module enables you to combine multiple image styles into a single image derivative.
The module does not sufficiently validate image style names when generating image derivatives. Under certain circumstances, this allows anonymous users to generate image derivatives without a valid token, potentially leading to a denial of service.
Sites are affected simply by having the module installed, even when no combined image styles are configured or in use.
This vulnerability is mitigated by the fact that only public files can be targeted, and derivatives of private files are still protected by core's token check.Solution: Install the latest version:

• If you use the Combined image style module, upgrade to Combined image style 1.0.7.

Reported By: 

• Sven Decabooter (svendecabooter)

Fixed By: 

• Sven Decabooter (svendecabooter)
• Swan Kalata (akalata) of the Drupal Security Team

Coordinated By: 

• Swan Kalata (akalata) of the Drupal Security Team
• Bram Driesen (bramdriesen) of the Drupal Security Team
• Greg Knaddison (greggles) of the Drupal Security Team
• Juraj Nemec (poker10) of the Drupal Security Team
• Jess (xjm) of the Drupal Security Team