CVE-2026-28495Public exploitNetwork attack vector

Remote code execution via CSRF configuration overwrite

Published Mar 10, 2026 · Updated Mar 10, 2026

Cross-site request forgery in GetSimple CMS Community Edition 3.3.22 and earlier allows remote attackers to execute code on the web server. The massiveAdmin gsConfigEdit method writes raw POST content directly into gsconfig.php without validation, sanitization, or CSRF-token verification. Exploitation requires a logged-in administrator to visit an attacker-controlled page, after which the injected PHP runs with the web server process on subsequent requests.

CVSS severity9.6
Critical
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site request forgery in GetSimple CMS Community Edition 3.3.22 and earlier allows remote attackers to execute code on the web server. The massiveAdmin gsConfigEdit method writes raw POST content directly into gsconfig.php without validation, sanitization, or CSRF-token verification. Exploitation requires a logged-in administrator to visit an attacker-controlled page, after which the injected PHP runs with the web server process on subsequent requests.

The record

CVE
CVE-2026-28495
Published
Mar 10, 2026
Updated
Mar 10, 2026
Vendor
GetSimpleCMS-CE
Product
GetSimple CMS Community Edition
Classifications
CWE-352, T1204.001, T1505.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 3.3.22

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

GetSimpleCMS-CE · GetSimple CMS Community Editionversion=<= 3.3.22

Published CVSS scores

9.6GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
T1204.001Malicious Link
T1505.003Web Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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