{"id":"CVE-2026-103474","title":"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","summary":"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 dire…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-434"],"vendor":"yii2-starter-kit","product":"yii2-starter-kit","affected":["yii2-starter-kit <= 4.2.0"],"published":"2026-09-30","updated":"2026-09-30","sourceUpdated":"2026-09-30T19:08:43.927","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-103474","references":[{"url":"https://github.com/yii-starter-kit/yii2-starter-kit","label":"disclosure@vulncheck.com"},{"url":"https://github.com/yii-starter-kit/yii2-starter-kit/blob/cc2c451e8c959c7300b04efea597706a38609f58/backend/modules/file/controllers/StorageController.php#L36","label":"disclosure@vulncheck.com"},{"url":"https://github.com/yii-starter-kit/yii2-starter-kit/issues/797","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/yii2-starter-kit-through-4.2.0-unrestricted-file-upload-rce","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-30T17:44:26.126873Z"},"ingestedAt":"2026-09-30T18:17:24.539Z","slug":"CVE-2026-103474","body":"## Overview\n\nyii2-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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}