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.
History

Thu, 26 Mar 2026 17:15:00 +0000

Type Values Removed Values Added
First Time appeared Craftcms craft Cms
CPEs cpe:2.3:a:craftcms:craft_cms:*:*:*:*:*:*:*:*
Vendors & Products Craftcms craft Cms
Metrics cvssV3_1

{'score': 7.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H'}


Wed, 25 Mar 2026 12:00:00 +0000

Type Values Removed Values Added
First Time appeared Craftcms
Craftcms craftcms
Vendors & Products Craftcms
Craftcms craftcms

Tue, 24 Mar 2026 19:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 24 Mar 2026 17:45:00 +0000

Type Values Removed Values Added
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.
Title Craft CMS: Potential authenticated Remote Code Execution via malicious attached Behavior
Weaknesses CWE-470
References
Metrics cvssV4_0

{'score': 8.6, '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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-03-25T03:56:03.039Z

Reserved: 2026-03-17T21:17:08.886Z

Link: CVE-2026-33157

cve-icon Vulnrichment

Updated: 2026-03-24T18:19:43.808Z

cve-icon NVD

Status : Analyzed

Published: 2026-03-24T18:16:09.590

Modified: 2026-03-26T17:08:13.740

Link: CVE-2026-33157

cve-icon Redhat

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