High 8.6Published Mar 24, 2026

CVE-2026-33157Craft CMS: Potential authenticated Remote Code Execution via malicious attached Behavior

Updated under an hour ago (Oct 27, 2026, 5:50 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 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.

CVSS: 8.6 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-470
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Mar 24, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

craftcms cms craftcms:cms (from the name)	from 5.6.0, < 5.9.13	CNA record
craftcms craft_cms craftcms:craft_cms	from 5.6.0 before 5.9.13	NVD

References

References

https://github.com/craftcms/cms/security/advisories/GHSA-2fph-6v5w-89hh	x-refsource-confirm, exploit, vendor-advisory
https://github.com/craftcms/cms/commit/97e90b4bdee369c1af3ca77a77531132df240e4e	x-refsource-misc, patch
https://github.com/craftcms/cms/releases/tag/5.9.13	x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.