CVE-2026-31857
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
craftcms/cmsPackagist | >= 5.0.0-RC1, < 5.9.9 | 5.9.9 |
craftcms/cmsPackagist | >= 4.0.0-beta.1, < 4.17.4 | 4.17.4 |
Affected products
13cpe:2.3:a:craftcms:craft_cms:*:*:*:*:*:*:*:*+ 10 more
- cpe:2.3:a:craftcms:craft_cms:*:*:*:*:*:*:*:*range: >=4.0.0.1,<4.17.4
- cpe:2.3:a:craftcms:craft_cms:4.0.0:-:*:*:*:*:*:*
- cpe:2.3:a:craftcms:craft_cms:4.0.0:beta1:*:*:*:*:*:*
- cpe:2.3:a:craftcms:craft_cms:4.0.0:beta2:*:*:*:*:*:*
- cpe:2.3:a:craftcms:craft_cms:4.0.0:beta3:*:*:*:*:*:*
- cpe:2.3:a:craftcms:craft_cms:4.0.0:beta4:*:*:*:*:*:*
- cpe:2.3:a:craftcms:craft_cms:4.0.0:rc1:*:*:*:*:*:*
- cpe:2.3:a:craftcms:craft_cms:4.0.0:rc2:*:*:*:*:*:*
- cpe:2.3:a:craftcms:craft_cms:4.0.0:rc3:*:*:*:*:*:*
- cpe:2.3:a:craftcms:craft_cms:5.0.0:-:*:*:*:*:*:*
- cpe:2.3:a:craftcms:craft_cms:5.0.0:rc1:*:*:*:*:*:*
Patches
Vulnerability mechanics
References
4- github.com/craftcms/cms/commit/8d4903647dcfd31b8d40ed027e27082013347a80nvdPatchWEB
- github.com/craftcms/cms/security/advisories/GHSA-fp5j-j7j4-mcxcnvdPatchVendor AdvisoryWEB
- github.com/advisories/GHSA-fp5j-j7j4-mcxcghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-31857ghsaADVISORY
News mentions
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