Vulnerability DatabaseCVE-2026-103474
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CVE-2026-103474
Published:September 30, 2026
Updated:October 15, 2026
yii2-starter-kit through 4.2.0 fails to validate file types in the backend storage upload actions, allowing authenticated managers to upload PHP files. Attackers with manager role can upload PHP scripts to the web-accessible storage directory and request them to execute arbitrary code on the server.
Related Resources (6)
https://github.com/yii-starter-kit/yii2-starter-kit
https://www.vulncheck.com/advisories/yii2-starter-kit-through-4.2.0-unrestricted-file-upload-rce
https://github.com/yii-starter-kit/yii2-starter-kit/blob/cc2c451e8c959c7300b04efea597706a38609f58/backend/modules/file/controllers/StorageController.php#L36
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103474.json
https://github.com/yii-starter-kit/yii2-starter-kit/issues/797
https://nvd.nist.gov/vuln/detail/CVE-2026-103474
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CVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.8
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Unrestricted Upload of File with Dangerous Type
CWE-434
EPSS
Base Score:
0.39