Craft Cms
CVE-2026-31857
HIGH
GHSA-fp5j-j7j4-mcxc
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionGitHub Advisory
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.
AnalysisAI
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. No patch is currently available for this HIGH severity vulnerability.
Technical ContextAI
Classified as CWE-94 (Code Injection). 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 sta
RemediationAI
Monitor vendor advisories for a patch.
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Same weakness CWE-94 – Code Injection
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External POC / Exploit Code
Leaving vuln.today