HIGH 8.7 NVD
CVE-2026-86730
Craft CMS versions before 5.10.12 fail to properly cleanse string-typed field-layout elements, allowing authenticated control-panel users to inject Yii2 behavio
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().
References
- https://github.com/craftcms/cms/security/advisories/GHSA-qj4v-m29p-fj4m
- https://www.vulncheck.com/advisories/craft-cms-5.0.0-rc1-before-5.10.12-behavior-injection
This high severity vulnerability with a CVSS score of 8.7 was published on 2026-09-08 via NVD.
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