Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Craftcms | Craft Cms | >= 4.0.0.1, < 4.17.4 |
Related Weaknesses (CWE)
References
- https://github.com/craftcms/cms/commit/8d4903647dcfd31b8d40ed027e27082013347a80Patch
- https://github.com/craftcms/cms/security/advisories/GHSA-fp5j-j7j4-mcxcPatchVendor Advisory
FAQ
What is CVE-2026-31857?
CVE-2026-31857 is a vulnerability with a CVSS score of 8.8 (HIGH). 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::getElement...
How severe is CVE-2026-31857?
CVE-2026-31857 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-31857?
Check the references section above for vendor advisories and patch information. Affected products include: Craftcms Craft Cms.