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

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-56661

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-56661

GetSimpleCMS-CE

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "GetSimpleCMS-CE",
    "product": "GetSimpleCMS-CE",
    "versions": [
      {
        "status": "affected",
        "version": "< 1.5"
      }
    ]
  }
]
Related CVEs
CVE-2026-56661

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#7737 · Revision 1
Added to Heist Feed
Publisher date
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