DRUPAL-CONTRIB-2026-012

None

CVSS

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EPSS

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Published

Feb 25, 2026

CISA due date

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The record

This module allows site builders to create so-called "theme\_rule" config entities. These theme rules can render pages with different themes than the default when certain conditions match. The module uses simple GET request to disable or enable theme rules, which allows attackers to disable or enable theme rules by tricking site administrators to click on links. This vulnerability is mitigated by the fact that an attacker must know the machine name of the theme rule.

Affected packages

Ecosystem	Package	Introduced	Fixed
Packagist:https://packages.drupal.org/8	drupal/theme_rule	0	1.2.1

Related vulnerabilities

CVE-2026-3211 Cross-Site Request Forgery (CSRF) vulnerability in Drupal Theme Negotiation by Rules… Same vulnerability