- Services module 1.x versions prior to 1.x-3.0.5-beta
This module provides a standardized solution for building API's so that external clients can communicate with Backdrop.
The module's taxonomy term index resource doesn't take into consideration certain access control tags provided (but unused) by core, that certain contrib modules depend on.
This vulnerability is mitigated by the fact your site must have the taxonomy term index resource enabled, your site must have a contributed module enabled which utilizes taxonomy term access control, and an attacker must know your API endpoint's path.
Upgrade your site to the most recent version of the Services module. Download available on the Services 1.x-3.0.5-beta release page.
- Greg Netsas of the Backdrop CMS Security Team