CVE-2026-103474: YII2-Starter-Kit

High severity, CVSS 8.8. EPSS: 0.4% chance of exploitation in the next 30 days.

yii2-starter-kit through 4.2.0 fails to validate file types in the backend storage upload actions, allowing authenticated managers to upload PHP files. Attackers with manager role can upload PHP scripts to the web-accessible storage directory and request them to execute arbitrary code on the server.

Affected products

• YII2-Starter-Kit YII2-Starter-Kit: up to and including 4.2.0

Published 2026-09-30. Last modified 2026-09-30.