TI-2026-38920 Aliases CVE-2026-53952

GetSimple CMS & GetSimpleCMS-CE have an Unauthenticated Admin Account Creation via Setup Logic Flaw

MEDIUM 50CWE-285Published 2026-09-11 · Updated 2026-09-14

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-285.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00553 46th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
GetSimpleCMS-CE	GetSimpleCMS-CE	up to 3.3.22	—	No fix listed	CNA
GetSimpleCMS	GetSimpleCMS	up to 3.4.0a	—	No fix listed	CNA

GetSimpleCMS-CE VendorGetSimpleCMS-CE Affected up to 3.3.22 Fixed in — No fix listed CNA
GetSimpleCMS VendorGetSimpleCMS Affected up to 3.4.0a Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:getsimple-ce:getsimple_cms::::::::	—	—	GetSimpleCMS-CE

cpe:2.3:a:getsimple-ce:getsimple_cms:*:*:*:*:*:*:*:* Versions — — ·GetSimpleCMS-CE

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-53952

References

Other 1

https://github.com/GetSimpleCMS-CE/GetSimpleCMS-CE/security/advisories/GHSA-rw2c-w4mg-46g4

TI-2024-36775 GetSimple CMS CE 3.3.19 suffers from arbitrary code execution in the template editing… CVSS 3.1CRITICAL 9.8
TI-2026-38921 GetSimple CMS: Predictable Password Reset Password Allows Administrator Account Takeover CVSS 3.1CRITICAL 9.1
TI-2025-30771 GetSimple CMS RCE in Edit component CVSS 4.0HIGH 8.6
TI-2026-40846 GetSimple CMS: Missing CSRF protection in UpdateCE allows forging a privileged server-side update request CVSS 3.1CRITICAL 9.6
TI-2026-40844 GetSimple CMS: CSRF, SSRF, and Unrestricted Zip Extraction CVSS 3.1CRITICAL 9.1
TI-2024-36777 GetSimple CMS CE 3.3.19 is vulnerable to Server-Side Request Forgery (SSRF) in the backend plugin module. CVSS 3.1HIGH 8.8

See all 17 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences