yii-starter-kit yii2-starter-kit up to 4.2.0 Debug/Gii allowedIPs information disclosure

Summaryinfo

A vulnerability has been found in yii-starter-kit yii2-starter-kit up to 4.2.0 and classified as problematic. This issue affects some unknown processing of the component Debug/Gii. Performing a manipulation of the argument allowedIPs results in information disclosure. This vulnerability is reported as CVE-2026-103475. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability classified as problematic has been found in yii-starter-kit yii2-starter-kit up to 4.2.0. This affects an unknown part of the component Debug/Gii. The manipulation of the argument allowedIPs with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-103475 since 09/30/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/30/2026). MITRE ATT&CK project uses the attack technique T1592 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• yii-starter-kit

Name

• yii2-starter-kit

Version

• 4.0
• 4.1
• 4.2.0

Website

• Product: https://github.com/yii-starter-kit/yii2-starter-kit/

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