---
id: CVE-2026-56661
title: >-
  GetSimple CMS is a content management system (CMS), and GetSimple CMS CE is
  the community edition of that CMS
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 (FI…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:L'
cwe:
  - CWE-918
vendor: GetSimpleCMS-CE
product: GetSimpleCMS-CE
affected:
  - GetSimpleCMS-CE < 1.5
published: '2026-10-01'
updated: '2026-10-01'
sourceUpdated: '2026-10-01T20:23:46.493'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-56661'
references:
  - url: >-
      https://github.com/GetSimpleCMS-CE/GetSimpleCMS-CE/security/advisories/GHSA-r7v8-mx29-5q8h
    label: security-advisories@github.com
  - url: >-
      https://github.com/GetSimpleCMS-CE/GetSimpleCMS-CE/security/advisories/GHSA-r7v8-mx29-5q8h
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-01T19:50:31.476852Z'
ingestedAt: '2026-10-01T19:58:57.559Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.