Theme Negotiation By Rules
Monthly
A Cross-Site Request Forgery (CSRF) vulnerability exists in the Drupal Theme Negotiation by Rules module, affecting all versions from 0.0.0 before 1.2.1. An attacker can exploit this flaw to perform unauthorized actions on behalf of authenticated users by crafting malicious requests that bypass CSRF protections in the theme negotiation functionality. The vulnerability has been officially documented by the Drupal security team via SA-contrib-2026-012, and users of this contrib module should prioritize patching to version 1.2.1 or later.
A Cross-Site Request Forgery (CSRF) vulnerability exists in the Drupal Theme Negotiation by Rules module, affecting all versions from 0.0.0 before 1.2.1. An attacker can exploit this flaw to perform unauthorized actions on behalf of authenticated users by crafting malicious requests that bypass CSRF protections in the theme negotiation functionality. The vulnerability has been officially documented by the Drupal security team via SA-contrib-2026-012, and users of this contrib module should prioritize patching to version 1.2.1 or later.