Drupal core - Moderately critical - Cross-site scripting - SA-CORE-2026-012

Project: Drupal core Date: 2026-July-15 Security risk: Moderately critical 13 ∕ 25 AC:Basic/A:User/CI:Some/II:Some/E:Theoretical/TD:Default Vulnerability: Cross-site scripting Affected versions: <10.6.13 || >=11.3.0 <11.3.14 || >=11.4.0 <11.4.4 || 11.0.* || 11.1.* || 11.2.* CVE IDs: CVE-2026-55805 Description: The Layout Builder module doesn't sufficiently sanitize block labels in certain scenarios, which can lead to a cross-site scripting (XSS) vulnerability. This is mitigated by the fact that both the attacker and the targeted user need to be using the Layout Builder editing interface. Solution: Install the latest version: Drupal 11 If you use Drupal 11.4.x, update to Drupal 11.4.4 . If you use Drupal 11.3.x, update to Drupal 11.3.14 . 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 10.6.13 . Drupal 10.5.x and below are end-of-life and do not receive security coverage. Drupal 8 and Drupal 9 have both reached end-of-life. Reported By: haii haii (hai27ii2o) Fixed By: danielveza Lee Rowlands (larowlan) of the Drupal Security Team Mingsong (mingsong) provisional member of the Drupal Security Team James Gilliland (neclimdul) of the Drupal Security Team Coordinated By: 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