CVE-2026-33157
Craft CMS: Potential authenticated Remote Code Execution via malicious attached Behavior
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.
| CWE | CWE-470 |
| Vendor | craftcms |
| Product | cms |
| Published | Mar 24, 2026 |
| Last Updated | Mar 25, 2026 |
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