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 ↗

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

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

← All CVEs