Vulnerability in Yii2-Starter-Kit
CVE-2026-103475
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/yii-starter-kit/yii2-starter-kit/issues/797 (issue-tracking)
- github.com/yii-starter-kit/yii2-starter-kit (product)
- github.com/yii-starter-kit/yii2-starter-kit/blob/cc2c451e8c959c7300b04efea59770… (technical-description)
- www.vulncheck.com/advisories/yii2-starter-kit-through-4.2.0-debug-and-gii-modul… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-103475?
- CVE-2026-103475 is a critical-severity vulnerability in Yii2-Starter-Kit, classified under Active Debug Code. CVSS score: 9.1/10. Published 2026-09-30.
- How severe is CVE-2026-103475?
- Critical severity. CVSS v3 base score is 9.1 out of 10.