CVE-2026-33157CWE-470

Craft CMS: Potential authenticated Remote Code Execution via malicious attached Behavior

High · published March 24, 2026

CVSS v4.0
8.6
EPSS
1%
Percentile
67.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
8.6 · 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
EPSS
0.01179 · 67.4th percentile
Weakness
CWE-470 · Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')
Published
2026-03-24T17:22Z
EPSS history
Timeline
  • 24 MAR 17:22Z
    Craft CMS: Potential authenticated Remote Code Execution via malicious attached Behavior
    cvelistv5