TI-2026-40846 Aliases CVE-2026-56662

GetSimple CMS: Missing CSRF protection in UpdateCE allows forging a privileged server-side update request

HIGH 76CWE-352Published 2026-10-01 · Updated 2026-10-06

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Tampering
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-352.

Summary

GetSimple CMS is a content management system (CMS), and GetSimple CMS CE is the community edition of that CMS. Prior to version 1.5, the UpdateCE update form contained no anti-CSRF token, and the POST handler performed no token or request-origin verification. A remote attacker can host a page that auto-submits a forged POST to the update endpoint; when an authenticated administrator visits it, the server performs an attacker-directed download-and-deploy operation in the administrator's session — with no further interaction. Because the deployed content is executed (see the related ZIP-extraction advisory), this yields remote code execution. The url field is additionally written into the form unescaped, providing a secondary HTML-injection sink via a malicious upgrade.json. This issue has been patched in version 1.5.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00249 16th percentileScored 2026-11-07

Fix Fixed GetSimpleCMS-CE (GetSimpleCMS-CE): 1.5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
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	before 1.5	1.5	Patch available	CNA

GetSimpleCMS-CE VendorGetSimpleCMS-CE Affected before 1.5 Fixed in 1.5 Patch available 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

Fix · CNA GetSimpleCMS-CE (GetSimpleCMS-CE) Fixed in 1.5

Timeline

2026-10-02 Threatist record created from CVE-2026-56662
2026-10-06 CISA SSVC decision points changed
2026-10-06 Priority changed: MEDIUM → HIGH

References

Other 1

https://github.com/GetSimpleCMS-CE/GetSimpleCMS-CE/security/advisories/GHSA-2rxv-4g4m-573w

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-2026-40844 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
TI-2026-50122 GetSimple CMS: Stored Cross-Site Scripting (XSS) via the "title" parameter in admin/components.php CVSS 4.0HIGH 8.7

See all 17 →

Sources

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