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TI-2026-40845 Aliases CVE-2026-56661

GetSimple CMS: Server-Side Request Forgery in the UpdateCE update endpoint

Priority HIGH 66CWE-918Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
Required
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · Low · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

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 update handler fetches a user-supplied URL with file_get_contents() after only format validation (FILTER_VALIDATE_URL) — there is no validation of the request destination. An attacker who can submit the form can make the server issue requests to arbitrary destinations, including internal-only services and cloud metadata endpoints (169.254.169.254). The fetched response body is written to a web-accessible file (/Tmpfile.zip) and is not deleted when the content is not a valid ZIP, turning this into a full-read SSRF: the attacker can retrieve the response of the internal request directly. This issue has been patched in version 1.5.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00263 18th 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
Partial

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

Affected products

VendorProductAffected versionsFixed inStatusSource
GetSimpleCMS-CEGetSimpleCMS-CEbefore 1.51.5Patch availableCNA
  • 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.

CPEVersionsRoleVendor
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

  1. 2026-10-02 Threatist record created from CVE-2026-56661

References

Other 1

  • 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