CVE-2026-103474

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.

  • Published Sep 30, 2026
  • CVSS 8.7 high
  • 0.4% chance of exploitation in the next 30 days (EPSS)

Affected software

CVE-2026-103474 at the National Vulnerability Database