# CVE-2026-53952

## Summary

- **CVE ID:** CVE-2026-53952
- **Severity:** CRITICAL
- **CVSS Score:** 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** CWE-285, CWE-306, CWE-489
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 14, 2026

## Description

GetSimple CMS is a content management system (CMS), and GetSimple CMS CE is the community edition of that CMS. A logic flaw in GetSimple CMS (v3.4.0a and below) and GetSimpleCMS-CE (v3.3.22 and below) allows unauthenticated attackers to create a new administrator account. The application features an automated security control designed to delete the sensitive `admin/setup.php` file post-installation. However, this control is neutralized by a self-exclusion bug within the deletion logic, leaving the setup script accessible for unauthorized account creation even after a legitimate installation is completed. As of time of publication, no known patched versions are available.

## Affected Products

- GetSimpleCMS-CE — GetSimpleCMS-CE (<= 3.3.22)
- GetSimpleCMS — GetSimpleCMS (<= 3.4.0a)

## References

- [CNA](https://github.com/GetSimpleCMS-CE/GetSimpleCMS-CE/security/advisories/GHSA-rw2c-w4mg-46g4)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.33%
- **EPSS Percentile:** 25.8

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-19._