This module provides a standardized solution for building API's so that external clients can communicate with Drupal.

The module accepts user submitted data in PHP's serialization format ("Content-Type: application/vnd.php.serialized") which can lead to arbitrary remote code execution.

This vulnerability is mitigated by the fact that an attacker must know your Service Endpoint's path, and the Service Endpoint must have "application/vnd.php.serialized" enabled as a request parser. The module does not create endpoints by default, however the "application/vnd.php.serialized" request parser is enabled by default on any endpoints created by a site builder.

CVE identifier(s) issued

  • A CVE identifier will be requested, and added upon issuance, in accordance with Drupal Security Team processes.

Versions affected

  • Services 7.x-3.x versions prior to 7.x-3.19.

Drupal core is not affected. If you do not use the contributed Services module, there is nothing you need to do.


Install the latest version:

You may disable "application/vnd.php.serialized" under "Request parsing" in Drupal to prevent the exploit: /admin/structure/services/list/[my-endpoint]/server

However, installing the latest version of the Services module is highly recommended.

Also see the Services project page.

Reported by

Fixed by

Coordinated by

Contact and More Information

The Drupal security team can be reached at security at or via the contact form at

Learn more about the Drupal Security team and their policies, writing secure code for Drupal, and securing your site.

Follow the Drupal Security Team on Twitter at

Edited 2017 March 9th to add details about which elements of the vulnerability are default or not.