CVE-2021-47734: Cmsimple

High severity, CVSS 7.8. EPSS: 0.8% chance of exploitation in the next 30 days.

CMSimple 5.4 contains an authenticated local file inclusion vulnerability that allows remote attackers to manipulate PHP session files and execute arbitrary code. Attackers can leverage the vulnerability by changing the functions file path and uploading malicious PHP code through session file upload mechanisms.

Affected products

• Cmsimple Cmsimple: version 5.4 only

Published 2025-12-23. Last modified 2026-06-17.