CVE-2026-33157
Craft CMS is Vulnerable to Authenticated Remote Code Execution via Malicious Attached Behavior
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| composer | craftcms/cms | >= 5.6.0, <= 5.9.12 | 5.9.13 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Craftcms | Craft Cms | from 5.6.0 before 5.9.13 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-2fph-6v5w-89hh
- https://github.com/craftcms/cms/security/advisories/GHSA-2fph-6v5w-89hh
- https://github.com/craftcms/cms/commit/97e90b4bdee369c1af3ca77a77531132df240e4e
- https://github.com/advisories/GHSA-255j-qw47-wjh5
- https://github.com/advisories/GHSA-7jx7-3846-m7w7
- https://github.com/craftcms/cms/releases/tag/5.9.13
- https://nvd.nist.gov/vuln/detail/CVE-2026-33157