CVE-2026-33157: Craft CMS

High severity, CVSS 7.2. EPSS: 1.1% chance of exploitation in the next 30 days.

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.

Affected products

• Craft CMS Craft CMS: from 5.6.0, before 5.9.13 (fixed in 5.9.13)

Published 2026-03-24. Last modified 2026-06-17.