CVE-2026-31857
HIGH
GHSA-fp5j-j7j4-mcxc
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3Tags
Description
Craft is a content management system (CMS). Prior to 5.9.9 and 4.17.4, 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 5.9.9 or 4.17.4 release to mitigate the issue.
Analysis
Remote code execution in Craft CMS 5 allows authenticated Control Panel users with basic access (including non-admin roles like Author or Editor) to execute arbitrary code by injecting malicious Twig templates through condition rule parameters. The vulnerability exploits an unsandboxed template rendering function that bypasses all security hardening settings, affecting versions prior to 5.9.9 and 4.17.4. …
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Remediation
Within 7 days: Identify all affected systems and apply vendor patches promptly. Validate that input sanitization is in place for all user-controlled parameters.
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External POC / Exploit Code
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