High severity8.8NVD Advisory· Published Sep 8, 2026· Updated Sep 8, 2026
CVE-2026-86730
CVE-2026-86730
Description
Craft CMS versions before 5.10.12 fail to properly cleanse string-typed field-layout elements, allowing authenticated control-panel users to inject Yii2 behavior attachments and event handlers. Attackers can post field-layout tab elements as JSON strings to bypass cleanse validation, then trigger arbitrary object instantiation and code execution through Craft::createObject().
Affected products
1Patches
Vulnerability mechanics
References
2News mentions
1- Craft CMS: Three High-Severity RCE and Command Execution Flaws Disclosed TogetherVypr Intelligence · Sep 10, 2026