High · CVSS 7.5CVE-2026-56661

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

Answer in brief

CVE-2026-56661 records a High severity (CVSS 7.5) vulnerability in GetSimple CMS: Server-Side Request Forgery in the UpdateCE update endpoint. The current sources do not mark it as known exploited. The current feed maps GetSimpleCMS-CE/GetSimpleCMS-CE (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 1, 2026Updated Oct 1, 2026Source checked Oct 1, 2026First seen by HOL Oct 1, 2026Material review Oct 1, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.5
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps GetSimpleCMS-CE/GetSimpleCMS-CE (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
GetSimpleCMS-CE/GetSimpleCMS-CEgeneric	<1.5	1.5

Recommended response

Check inventory. Check lockfiles and deployed manifests for GetSimpleCMS-CE/GetSimpleCMS-CE.
Review the reported fix. Update GetSimpleCMS-CE/GetSimpleCMS-CE to 1.5 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Oct 1, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 1, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 1, 2026

Sources and claim methodology

GitHub security advisorygithub.com

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.