Craft CMS: Potential authenticated Remote Code Execution via malicious attached Behavior_CVE-2026-33157

{
    "lastseen": "",
    "description": "Craft CMS is a content management system (CMS). From version 5.6.0 to before version 5.9.13, a Remote Code Execution (RCE) vulnerability exists in Craft CMS, it can be exploited by any authenticated user with control panel access. This is a bypass of a previous fix. The existing patches add cleanseConfig() to assembleLayoutFromPost() and various FieldsController actions to strip Yii2 behavior/event injection keys (\"as\" and \"on\" prefixed keys). However, the fieldLayouts parameter in ElementIndexesController::actionFilterHud() is passed directly to FieldLayout::createFromConfig() without any sanitization, enabling the same behavior injection attack chain. This issue has been patched in version 5.9.13.",
    "published": "2026-03-24T17:22:00.966Z",
    "modified": "2026-03-25T03:56:03.039Z",
    "type": "cve",
    "title": "Craft CMS: Potential authenticated Remote Code Execution via malicious attached Behavior",
    "source": "GitHub_M",
    "references": "https://github.com/craftcms/cms/security/advisories/GHSA-2fph-6v5w-89hh\nhttps://github.com/craftcms/cms/commit/97e90b4bdee369c1af3ca77a77531132df240e4e\nhttps://github.com/craftcms/cms/releases/tag/5.9.13",
    "id": "CVE-2026-33157",
    "bulletinFamily": "",
    "cwe": [
        "CWE-470"
    ],
    "cvelist": null,
    "sourceData": "craftcms cms >= 5.6.0, < 5.9.13",
    "sourceHref": "",
    "cvss": {
        "score": 8.6,
        "severity": "HIGH",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "cms",
    "version": ">= 5.6.0, < 5.9.13",
    "vendor": "craftcms",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}