View online: https://www.drupal.org/sa-contrib-2026-217 Project: Advanced Filesystem [1] Project machine name: advanced_filesystem Date: 2026-October-07 Security risk: *Moderately critical* 12 ∕ 25 AC:Basic/A:None/CI:None/II:Some/E:Theoretical/TD:Default [2] Vulnerability: Cross-Site Request Forgery Affected versions: <1.0.28 CVE IDs: CVE-2026-107262 Description: Advanced File System turns Drupal's file storage into a manageable, observable and maintainable subsystem. The Advanced Filesystem: Backup submodule does not sufficiently validate certain requests. This may allow an attacker to trick an authenticated user into performing unintended actions through a Cross-Site Request Forgery (CSRF) vulnerability. The vulnerability is mitigated by the fact that advanced_filesystem_backup module must be enabled. Solution: Install the latest version: * If you use the Advanced File System module, upgrade to Advanced File System 1.0.28 [3] Reported By: * Marcus Johansson (marcus_johansson) [4] Fixed By: * Cristiano Demari (cristianodemari) [5] Coordinated By: * Greg Knaddison (greggles) [6] of the Drupal Security Team * Juraj Nemec (poker10) [7] of the Drupal Security Team ------------------------------------------------------------------------------ Contribution record [8] [1] https://www.drupal.org/project/advanced_filesystem [2] https://www.drupal.org/security-team/risk-levels [3] https://www.drupal.org/project/advanced_filesystem/releases/1.0.28 [4] https://www.drupal.org/u/marcus_johansson [5] https://www.drupal.org/u/cristianodemari [6] https://www.drupal.org/u/greggles [7] https://www.drupal.org/u/poker10 [8] https://new.drupal.org/contribution-record?source_link=https%3A//www.drupal....