{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "5.0.0-RC1"
              },
              {
                "fixed": "5.9.9"
              }
            ]
          },
          "events": [
            {
              "introduced": "04755d93f86d07cc183db47db8a0eee106892e30"
            },
            {
              "fixed": "74eb5d3a9ffa935df1a4fc2b6ddb1042d9f8e582"
            }
          ],
          "repo": "https://github.com/craftcms/cms",
          "type": "GIT"
        },
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "4.0.0-beta.1"
              },
              {
                "fixed": "4.17.4"
              }
            ]
          },
          "events": [
            {
              "introduced": "2c20eed81e34c35b880ddd9e1bc61c9cfd9c6690"
            },
            {
              "fixed": "5020fa5be830af712694f9f8164599a1789cc094"
            }
          ],
          "repo": "https://github.com/craftcms/cms",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-fp5j-j7j4-mcxc"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-94"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31857.json"
  },
  "details": "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.",
  "id": "CVE-2026-31857",
  "modified": "2026-04-01T23:08:42.240472248Z",
  "published": "2026-03-11T17:30:29.092Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31857.json"
    },
    {
      "type": "ADVISORY",
      "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": "FIX",
      "url": "https://github.com/craftcms/cms/commit/8d4903647dcfd31b8d40ed027e27082013347a80"
    }
  ],
  "schema_version": "1.7.3",
  "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"
}