Internal response disclosure via unchecked update URL
Published Oct 1, 2026 · Updated Oct 1, 2026
Server-side request forgery in UpdateCE through 1.4 for GetSimple CMS Community Edition allows remote authenticated users to read internal HTTP responses. The update handler checks only URL syntax before fetching the destination and writes the response to a web-accessible Tmpfile.zip, leaving non-ZIP content there. Administrator access to the update form is required; an internal service or metadata endpoint must return content for disclosure.
Summary
What happened
Server-side request forgery in UpdateCE through 1.4 for GetSimple CMS Community Edition allows remote authenticated users to read internal HTTP responses. The update handler checks only URL syntax before fetching the destination and writes the response to a web-accessible Tmpfile.zip, leaving non-ZIP content there. Administrator access to the update form is required; an internal service or metadata endpoint must return content for disclosure.
The record
- CVE
- CVE-2026-56661
- Published
- Oct 1, 2026
- Updated
- Oct 1, 2026
- Vendor
- GetSimpleCMS-CE
- Product
- GetSimple CMS Community Edition
- Classifications
- CWE-918
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Oct 1, 2026CVE publishedPublication date reported by the CVE source.
- Oct 1, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=< 1.5
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Activity data is delayed. The latest report is Sep 28, 2026.
Weakness, pattern, technique
Public exploit references
- UpdateCE full-read SSRF proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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