Drupal core - Critical - PHP object injection - SA-CORE-2026-005

Project: Drupal core Project machine name: drupal Date: 2026-June-17 Security risk: Critical 18 ∕ 25 AC:None/A:User/CI:All/II:All/E:Theoretical/TD:Uncommon Vulnerability: PHP object injection 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-2026-55803 Description: SA-CORE-2019-003 added protection for fields that store serialized data to disallow direct writes via web services. The above fix did not cover all potential attack vectors for JSON:API. An attacker with appropriate JSON:API write permission could potentially…

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