Drupal core - Less critical - Cache poisoning and open redirect - SA-CORE-2026-007

Project: Drupal core Project machine name: drupal Date: 2026-June-17 Security risk: Less critical 9 ∕ 25 AC:Basic/A:None/CI:None/II:None/E:Theoretical/TD:Default Vulnerability: Cache poisoning and open redirect Affected versions: <10.5.12 || >=10.6.0 <10.6.11 || >=11.2.0 <11.2.14 || >=11.3.0 <11.3.12 || 11.0.* || 11.1.* CVE IDs: CVE-2026-55806 Description: Drupal core ships a rebuild.php front controller that can be used to rebuild Drupal (clearing the caches and rebuilding the container) when the site is in an unexpected condition. This script doesn't correctly check the Host header against…

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