CVE-2026-103474
yii2-starter-kit through 4.2.0 Unrestricted File Upload RCE
yii2-starter-kit yii2-starter-kit
CVSS
8.7HighExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.39%Chance of exploitation activity in the next 30 days, higher than 31% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
What fixes it
No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.
Description
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.
Text from CVE List
Affected versions 1
- yii2-starter-kitaffected: all versions through 4.2.0CVE List
References 4
- vulncheck.com/advisories/yii2-starter-kit-through-4.2.0-unrestricted-file-upload-rceAdvisoryvia CVE List
- github.com/yii-starter-kit/yii2-starter-kit/issues/797Referencevia CVE List
- github.com/yii-starter-kit/yii2-starter-kitReferencevia CVE List
- github.com/yii-starter-kit/yii2-starter-kit/blob/cc2c451e8c959c7300b04efea597706a38609f58/backend/modules/file/controllers/StorageController.php#L36Referencevia CVE List