Is CVE-2021-47734 actively exploited?

No active exploitation of CVE-2021-47734 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-47734 be exploited remotely?

No. CVE-2021-47734 requires local access to exploit.

What is the CVSS score of CVE-2021-47734?

CVE-2021-47734 has a CVSS score of 7.8 (HIGH).

HOME VULNERABILITIESCVE-2021-47734

HIGH

CVE-2021-47734

CWE-98Published: December 23, 2025· Updated: Jun 17, 2026

7.8

CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2021-47734 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.8.