CVE-2026-103475yii2-starter-kit through 4.2.0 Debug and Gii Module Exposure
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It affects yii2-starter-kit. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 0.40%, higher than 32% of scored CVEs.
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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.
- CVSS
- 9.1 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- Weakness (CWE)
- CWE-489
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.40% (percentile 32)
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Sep 30, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
yii2-starter-kit yii2-starter-kit yii2_starter_kit:yii2_starter_kit (from the name) | through 4.2.0 | CNA record |
References
- https://github.com/yii-starter-kit/yii2-starter-kit/issues/797issue-tracking
- https://github.com/yii-starter-kit/yii2-starter-kitproduct
- https://github.com/yii-starter-kit/yii2-starter-kit/blob/cc2c451e8c959c7300b04efea597706a38609f58/common/config/web.php#L21technical-description
- https://www.vulncheck.com/advisories/yii2-starter-kit-through-4.2.0-debug-and-gii-module-exposurethird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.