CVE-2021-47734

High · 7.8

CVSS

7.8

EPSS

0.8%

Published

Dec 23, 2025

CISA due date

—

The record

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 packages

Ecosystem	Package	Introduced	Fixed