Is CVE-2021-47735 actively exploited?

No active exploitation of CVE-2021-47735 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-47735 be exploited remotely?

Yes. CVE-2021-47735 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-47735?

CVE-2021-47735 has a CVSS score of 8.8 (HIGH).

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HIGH

CVE-2021-47735

CWE-94Published: December 23, 2025· Updated: Jun 17, 2026

8.8

CVSS v3.1

Official Description

CMSimple 5.4 contains an authenticated remote code execution vulnerability that allows logged-in attackers to inject malicious PHP code into template files. Attackers can exploit the template editing functionality by crafting a reverse shell payload and saving it through the template editing endpoint with a valid CSRF token.

NVD Source

Technical Analysis

CVE-2021-47735 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

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 8.8.