Craft Cms
CVE-2026-31857
HIGH
GHSA-fp5j-j7j4-mcxc
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionNVD
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. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Authenticated Control Panel user account (Author, Editor, or equivalent non-admin role) with access to element listing endpoints in Craft CMS versions prior to 5.9.9 or 4.17.4. Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Exploitation requires authentication. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A remote attacker (requires authentication) could exploit this vulnerability to compromise the affected system. |
| Remediation | Monitor vendor advisories for a patch. Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 7 days: Identify all affected systems and apply vendor patches promptly. …
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