Is this vulnerability remotely exploitable over the internet?

Yes, but only by authenticated users with specific permissions. An attacker must be able to log into the Evolution CMS manager and have rights to create or modify modules; from there, they can deliver malicious payloads over standard HTTP(S).

What level of access does an attacker need to exploit this issue?

The attacker needs an account with module creation or editing privileges. Compromised admin accounts, overprivileged editor accounts, or shared administrative credentials significantly increase the likelihood of exploitation.

What is the safest general fix pattern for this kind of vulnerability?

The safest pattern is to eliminate direct execution of user-supplied content: treat module parameters as data only, avoid mechanisms that interpret stored values as PHP, and introduce strict validation with a whitelist of allowed constructs or settings in extensibility points.

Severity:

HIGH RISK

(8.8)

Code Injection (CWE-94) via Module Parameters in Evolution CMS

CVE-2021-47939

Published:

May 10, 2026

Status:

Received

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-94

HIGH RISK

HIGH

(8.8)

PHP Code Injection via File Upload (CWE-94) in Aero CMS Admin Post Creation

Remote Code Execution by authenticated users via malicious file upload

May 10, 2026

CWE-306

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication (CWE-306) Leading to Remote Code Execution in OpenCATS Resume Uploads

Remote Code Execution by Unauthenticated Attackers

May 10, 2026

Vulnerability Type

Category:

Code Injection

CWE:

CWE-94

Impact:

Remote Code Execution by Authenticated Users

Severity:

HIGH RISK

(8.8)

CVSS Version:

3.1

Vulnerability Type

Category:

Code Injection

CWE:

CWE-94

Impact:

Remote Code Execution by Authenticated Users

Severity:

HIGH RISK

(8.8)

CVSS Version:

3.1

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Code Injection (CWE-94) via Module Parameters in Evolution CMS

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(8.8)

PHP Code Injection via File Upload (CWE-94) in Aero CMS Admin Post Creation

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication (CWE-306) Leading to Remote Code Execution in OpenCATS Resume Uploads

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Ship clean & secure code faster

Ship clean & secure code faster

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