Vulnerability · Published Sep 11, 2026 · Assigned by GitHub_M
CVE-2026-53952GetSimple CMS & GetSimpleCMS-CE have an Unauthenticated Admin Account Creation via Setup Logic Flaw
Critical 9.8
In plain English
A critical-severity missing authentication in GetSimpleCMS from GetSimpleCMS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 46% of all known vulnerabilities).
Official 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| GetSimpleCMS-CE | GetSimpleCMS-CE | <= 3.3.22 |
| GetSimpleCMS | GetSimpleCMS | <= 3.4.0a |
Weakness: CWE-285, CWE-306, CWE-489 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H