CVE-2026-103475
Critical
Description
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.
SeverityCritical
CVSS9.1
Exploit probability—
ProductYii2-starter-kit
PublishedSep 30, 2026
First seenSep 30, 2026
Weakness typeCWE-489CWE-489
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| yii2-starter-kit yii2-starter-kit | v ≤ 4.2.0 | — |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.