CVE-2026-103475 yii2-starter-kit - Broken Access Control

yii2-starter-kit through 4.2.0 contains a broken access control caused by allowedIPs set to ['*'] in debug and Gii modules, letting unauthenticated remote attackers read sensitive data and write PHP files, exploit requires no authentication.

CVSS base score 9.1 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.40% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Information Disclosure, File System Write
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
30 September 2026
Updated
15 October 2026
Weakness
CWE-489

Vendor fix

Update to the latest version that restricts allowedIPs properly.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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