---
title: "CVE-2026-53952: GetSimple CMS - Authentication Bypass"
description: "GetSimple CMS <= 3.4.0a and GetSimpleCMS-CE <= 3.3.22 contain an authentication bypass caused by a logic flaw in the automated deletion of admin/setup.php, letting unauthenticated attackers create new admin accounts, exploit requires access to setup script post-installation."
url: https://panop.io/threat-heartbeat/CVE-2026-53952/
---

# CVE-2026-53952 GetSimple CMS - Authentication Bypass

GetSimple CMS <= 3.4.0a and GetSimpleCMS-CE <= 3.3.22 contain an authentication bypass caused by a logic flaw in the automated deletion of admin/setup.php, letting unauthenticated attackers create new admin accounts, exploit requires access to setup script post-installation.

CVSS base score 9.8 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.55% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-53952)

## Details

Type

Authentication Bypass

Impact

Broken Authentication

CVSS vector

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

Published

11 September 2026

Updated

15 October 2026

Weakness

[CWE-285](https://cwe.mitre.org/data/definitions/285.html)

## Vendor fix

No patched versions available; monitor for updates and restrict access to setup script.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-53952](https://nvd.nist.gov/vuln/detail/CVE-2026-53952)
- [https://github.com/GetSimpleCMS-CE/GetSimpleCMS-CE/security/advisories/GHSA-rw2c-w4mg-46g4](https://github.com/GetSimpleCMS-CE/GetSimpleCMS-CE/security/advisories/GHSA-rw2c-w4mg-46g4)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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