GHSA-fp5j-j7j4-mcxcHigh

CraftCMS has an RCE vulnerability via relational conditionals in the control panel

Published
March 11, 2026
Last Modified
March 11, 2026

🔗 CVE IDs covered (1)

CVE-2026-31857 →

📋 Description

A Remote Code Execution vulnerability exists in the Craft CMS 5 conditions system.

The BaseElementSelectConditionRule::getElementIds() method passes user-controlled string input through renderObjectTemplate() -- an unsandboxed Twig rendering function with escaping disabled.

Any authenticated Control Panel user (including non-admin roles such as Author or Editor) can achieve full RCE by sending a crafted condition rule via standard element listing endpoints.

This vulnerability requires no admin privileges, no special permissions beyond basic control panel access, and bypasses all production hardening settings (allowAdminChanges: false, devMode: false, enableTwigSandbox: true).

Users should update to the patched 5.99 release to mitigate the issue.

🎯 Affected products2

  • composer/craftcms/cms:>= 5.0.0-RC1, <= 5.9.8
  • composer/craftcms/cms:>= 4.0.0-beta.1, <= 4.17.3

🔗 References (4)