CVE-2026-33157 — Unsafe Reflection in Craft CMS

CWE-470 — Unsafe Reflection5 documents5 sources
Severity
8.6HIGHNVD
EPSS
0.1%
top 82.17%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Craftcms Craft CMSCraftcms CMS
Timeline
PublishedMar 24

Description

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 ElementIndexe…

CVSS 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

Affected Packages3 packages

▶Packagistcraftcms/cms5.6.0 — 5.9.13
▶NVDcraftcms/craft_cms5.6.0 — 5.9.13
▶CVEListV5craftcms/cms>= 5.6.0, < 5.9.13

Patches

Patch: github.com ↗

🔴Vulnerability Details

3
OSV
Craft CMS is Vulnerable to Authenticated Remote Code Execution via Malicious Attached Behavior↗2026-03-24
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GHSA
Craft CMS is Vulnerable to Authenticated Remote Code Execution via Malicious Attached Behavior↗2026-03-24
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CVEList
Craft CMS: Potential authenticated Remote Code Execution via malicious attached Behavior↗2026-03-24
▶

🕵️Threat Intelligence

1
Wiz
CVE-2026-33157 Impact, Exploitability, and Mitigation Steps | Wiz↗
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CVE-2026-33157 — Unsafe Reflection in Craft CMS | cvebase