What is CVE-2026-53952?

CVE-2026-53952 is a critical-severity vulnerability in Getsimplecms, classified under Improper Authorization. CVSS score: 9.8/10. Published 2026-09-11.

How severe is CVE-2026-53952?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Getsimplecms

CVE-2026-53952

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.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Getsimplecms — versions <= 3.4.0a
Getsimplecms-ce — versions <= 3.3.22

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-53952?: CVE-2026-53952 is a critical-severity vulnerability in Getsimplecms, classified under Improper Authorization. CVSS score: 9.8/10. Published 2026-09-11.
How severe is CVE-2026-53952?: Critical severity. CVSS v3 base score is 9.8 out of 10.