CVE-2026-86730 — Craft CMS 5.0.0-RC1 before 5.10.12 Behavior Injection RCE
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…
Published: 2026-09-08 · CVSS: 8.7 · CVSS 4.0
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().
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7