CVE-2026-28495
Received Received - Intake

CSRF-Enabled Remote Code Execution in GetSimple CMS massiveAdmin Plugin

Publication date: 2026-03-10

Last updated on: 2026-03-12

Assigner: GitHub, Inc.

Description
GetSimple CMS is a content management system. The massiveAdmin plugin (v6.0.3) bundled with GetSimpleCMS-CE v3.3.22 allows an authenticated administrator to overwrite the gsconfig.php configuration file with arbitrary PHP code via the gsconfig editor module. The form lacks CSRF protection, enabling a remote unauthenticated attacker to exploit this via Cross-Site Request Forgery against a logged-in admin, achieving Remote Code Execution (RCE) on the web server.

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Meta Information

Published
2026-03-10
Last Modified
2026-03-12
Generated
2026-07-26
AI Q&A
2026-03-10
EPSS Evaluated
2026-07-25
NVD
CVE-2026-28495
EUVD
EUVD-2026-10811

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
getsimple-ce getsimple_cms to 3.3.22 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-352 The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.

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Executive Summary

This vulnerability exists in the massiveAdmin plugin (version 6.0.3) bundled with GetSimpleCMS-CE version 3.3.22. It allows an authenticated administrator to overwrite the gsconfig.php configuration file with arbitrary PHP code through the gsconfig editor module.

The form used for this operation lacks Cross-Site Request Forgery (CSRF) protection, which means a remote unauthenticated attacker can trick a logged-in administrator into executing a malicious request.

By exploiting this vulnerability via CSRF, the attacker can achieve Remote Code Execution (RCE) on the web server, potentially taking full control of the server.

Detection Guidance

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Impact Analysis

This vulnerability can have severe impacts including allowing an attacker to execute arbitrary code on the web server remotely.

  • Complete compromise of the web server hosting the GetSimple CMS.
  • Potential data theft, data loss, or unauthorized data modification.
  • Disruption of website availability or service through malicious actions.
  • Use of the compromised server as a pivot point for further attacks within the network.
Compliance Impact

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Mitigation Strategies

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