CVE-2026-103475: YII2-Starter-Kit

Critical severity, CVSS 9.1. EPSS: 0.4% chance of exploitation in the next 30 days.

yii2-starter-kit through 4.2.0 exposes the Yii debug and Gii modules to all IP addresses by setting allowedIPs to ['*'] in its default development configuration. Unauthenticated remote attackers can access the debug endpoint to read sensitive data including session cookies and database queries, or access the Gii endpoint to generate and write PHP files into the application directory.

Affected products

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

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