GHSA-FP5J-J7J4-MCXC

Vulnerability from github – Published: 2026-03-11 14:56 – Updated: 2026-03-11 20:44
VLAI
Summary
CraftCMS has an RCE vulnerability via relational conditionals in the control panel
Details

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 5.99 release to mitigate the issue.

Severity
8.1 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 5.9.8"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "craftcms/cms"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.0.0-RC1"
            },
            {
              "fixed": "5.9.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.17.3"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "craftcms/cms"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.0-beta.1"
            },
            {
              "fixed": "4.17.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-31857"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-11T14:56:45Z",
    "nvd_published_at": "2026-03-11T18:16:24Z",
    "severity": "HIGH"
  },
  "details": "A Remote Code Execution vulnerability exists in the Craft CMS 5 conditions system.\n\nThe `BaseElementSelectConditionRule::getElementIds()` method passes user-controlled string input\nthrough `renderObjectTemplate()` -- an unsandboxed Twig rendering function with escaping disabled.\n\nAny authenticated Control Panel user (including non-admin roles such as Author or Editor) can achieve full\nRCE by sending a crafted condition rule via standard element listing endpoints.\n\nThis vulnerability requires no admin privileges, no special permissions beyond basic control panel access, and\nbypasses all production hardening settings (allowAdminChanges: false, devMode: false,\nenableTwigSandbox: true).\n\nUsers should update to the patched 5.99 release to mitigate the issue.",
  "id": "GHSA-fp5j-j7j4-mcxc",
  "modified": "2026-03-11T20:44:40Z",
  "published": "2026-03-11T14:56:45Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/craftcms/cms/security/advisories/GHSA-fp5j-j7j4-mcxc"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31857"
    },
    {
      "type": "WEB",
      "url": "https://github.com/craftcms/cms/commit/8d4903647dcfd31b8d40ed027e27082013347a80"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/craftcms/cms"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U",
      "type": "CVSS_V4"
    }
  ],
  "summary": "CraftCMS has an RCE vulnerability via relational conditionals in the control panel"
}



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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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