LowDRUPAL-CORE-2026-007BIT-drupal-2026-55806CVE-2026-55806

DRUPAL-CORE-2026-007 in drupal/core

Published 17 Jun 2026 · Updated 10 Sept 2026

Affected package

Affected: <10.5.12 · >=10.6.0 <10.6.11 · >=11.2.0 <11.2.14 · >=11.3.0 <11.3.12 · >=11.0.0 <11.1.0 · >=11.1.0 <11.2.0
Fixed in: 10.5.12, 10.6.11, 11.1.0, 11.2.0, 11.2.14, 11.3.12

Update to the fixed version for your release line, for example:composer require drupal/core:^11.3.12

Details

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 the list of trusted host patterns. This could result in cache poisoning or a redirect to an attacker-controlled domain.

Is DRUPAL-CORE-2026-007 in any of your client repos?

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References

Linkwww.drupal.org/sa-core-2026-007

Advisory data from OSV.dev (opens OSV.dev in a new tab), refreshed daily.