CVE-2021-47939

Description

Evolution CMS 3.1.6 contains a remote code execution vulnerability that allows authenticated users with module creation permissions to execute arbitrary system commands by injecting PHP code into module parameters. Attackers can send POST requests to /manager/index.php with malicious PHP code in the 'post' parameter to create modules that execute arbitrary commands when invoked.

Description (MITRE) cveawg.mitre.org

Pulled from cveawg.mitre.org/api/cve/CVE-2021-47939 on 2026-07-02. Shown when MITRE's text differs from the cvelistV5 mirror.

Evolution CMS 3.1.6 contains a remote code execution vulnerability that allows authenticated users with module creation permissions to execute arbitrary system commands by injecting PHP code into module parameters. Attackers can send POST requests to /manager/index.php with malicious PHP code in the 'post' parameter to create modules that execute arbitrary commands when invoked.

Overview

State

—

Assigner (CNA)

—

CVSS severity

high

CVSS score

8.8 / 10

CVSS vector

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Effective score

8.8 / 10 HIGH source: CNA overview

CWE(s)

—

Reserved

—

Published

—

Last updated

—

Source

https://www.tenable.com/cve/CVE-2021-47939

Linked Threat

CVE-2021-47939 — CVE-2021-47939

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published

2026-05-10 13:16:30 UTC

NVD last modified

2026-05-12 14:24:15 UTC

NVD CVSS v3.1

8.8 / 10 HIGH source: disclosure@vulncheck.com

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploitability subscore

2.8 / 10

Impact subscore

5.9 / 10

EPSS score

0.0037 (probability of exploitation in next 30 days)

EPSS percentile

58.88% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

NVD-assigned CWE(s): CWE-94 (differs from the CNA list above)

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID

EUVD-2021-34800

Assigner

VulnCheck

Published

May 10, 2026, 12:43:57 PM

Updated

May 11, 2026, 4:09:28 PM

EUVD base score (CVSS 4.0)

8.7 / 10
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

EUVD-reported EPSS

0.3700

Vendors

Evo

Products

Evolution CMS (3.1.6)

ENISA description: Evolution CMS 3.1.6 contains a remote code execution vulnerability that allows authenticated users with module creation permissions to execute arbitrary system commands by injecting PHP code into module parameters. Attackers can send POST requests to /manager/index.php with malicious PHP code in the 'post' parameter to create modules that execute arbitrary commands when invoked.

Vendor references (0)

References embedded in the original CVE record by the assigning CNA.

None in the CVE record.

Web references (7)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

• https://evo.im/ tenable:evo.im
• https://github.com/evolution-cms/evolution/releases tenable:github.com
• https://nvd.nist.gov/vuln/detail/CVE-2021-47939 tenable:nvd.nist.gov
• https://www.cve.org/CVERecord?id=CVE-2021-47939 tenable:www.cve.org
• https://www.exploit-db.com/exploits/50296 tenable:www.exploit-db.com
• https://www.first.org/epss/ tenable:www.first.org
• https://www.vulncheck.com/advisories/evolution-cms-authenticated-remote-code-execution-via-module-creation tenable:www.vulncheck.com

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

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• CISA Warns of Exploited Microsoft Defender 0-Day Flaws
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  2026-05-26 02:51 UTC
• Security Update Guide - Microsoft
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  The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

  2026-05-26 02:51 UTC
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  2026-05-26 02:51 UTC
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  2026-05-26 02:51 UTC
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  2026-05-26 02:51 UTC
• Mitigate vs Remediate: Understanding the Difference and Best ... - Emagined
  web:www.emagined.com

  Discover the difference between mitigation and remediation in vulnerability management. Learn best practices for Pentest remediation and effective cyber protection.

  2026-05-26 02:51 UTC
• Oracle Critical Patch Update Advisory - April 2026
  web:www.oracle.com

  This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.

  2026-05-26 02:51 UTC
• Vulnerability Remediation vs. Mitigation: What are the Differences ...
  web:www.secure.com

  Learn the difference between vulnerability remediation and mitigation , and how a risk-based strategy can strengthen your security posture.

  2026-05-26 02:51 UTC
• Windows 11 April 2026 Update tested: What's new, improved and fixed
  web:www.windowslatest.com

  Windows 11 April 2026 update adds Narrator Copilot support, faster Settings, File Explorer fixes, and key security improvements.

  2026-05-26 02:51 UTC

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