Drupal Core Gadget Chain Vulnerability Could Enable Remote Code Execution Under Specific Conditions
Drupal has released patches for a moderately critical gadget chain vulnerability in core that, when combined with a separate insecure deserialization flaw, could allow remote code execution.
The Drupal Security Team has disclosed a gadget chain vulnerability in Drupal core, tracked as CVE-2025-13081, affecting versions 8.0.0 through 11.2.7. The issue is rated moderately critical with a CVSS score of 14 out of 25, reflecting its dependency on a separate vulnerability for exploitation. Patches have been released for all supported branches: Drupal 10.4.9, 10.5.6, 11.1.9, and 11.2.8.
The vulnerability involves a chain of methods within Drupal core that becomes exploitable only when an insecure deserialization vulnerability exists on the site. This so-called "gadget chain" does not pose a direct threat on its own, but it can be used as a vector to achieve remote code execution if the application deserializes untrusted data due to another flaw. The Drupal Security Team emphasized that no such exploits are known in Drupal core itself.
The gadget chain is not directly exploitable; an attacker must first find a separate unserialize() vulnerability to pass unsafe input. This layered requirement reduces the immediate risk, but the Drupal Security Team still urges administrators to apply the patches promptly. The advisory notes that Drupal 11.0.x, 10.3.x, and earlier versions are end-of-life and no longer receive security coverage, leaving sites on those branches exposed.
The vulnerability was reported by anzuukino and fixed by a team including Anna Kalata, catch, Neil Drumm, Greg Knaddison, Lee Rowlands, Dave Long, Drew Webber, Juraj Nemec, Ra Mänd, and Jess. The coordinated release involved multiple members of the Drupal Security Team.
This disclosure follows a pattern of Drupal issuing urgent security patches. In a separate advisory earlier this year, Drupal warned of a "highly critical" vulnerability and prepared an emergency patch, cautioning that exploit code could appear within hours or days. While CVE-2025-13081 is less severe, it highlights the ongoing need for vigilance in maintaining Drupal installations.
Administrators should update to the latest versions immediately. Those on unsupported branches must upgrade to a supported release to receive security fixes. The Drupal Security Team continues to monitor for any signs of exploitation and encourages responsible disclosure of any related findings.