CVE-2026-56661

7.5 HIGH 0.3% exploit odds Fix listed Disclosure Web app

What it is

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.

At a glance

Exploitability: Can be exploited over the network with an admin-level account, but needs a user to act. High risk of data exposure.
Exploit odds: 0.3% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2026-06-22 16:39 UTC ReservedThe CVE id was reserved by its CNA
2026-10-01 20:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-10-01 20:23 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.3% in the next 30 days (EPSS).
Severity: 7.5 HIGH (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2026-10-01 20:17 UTC
Last modified: 2026-10-01 20:23 UTC
Exploit probability: 0.3% · EPSS, next 30 days
Weakness: CWE-918 · Server-side request forgery
Record status: Deferred

Attack profile CVSS 3.1 · 7.5

Attack vector: Network
Complexity: Low
Privileges needed: High
User interaction: Required
Scope: Changed
Confidentiality: High
Integrity: Low
Availability: Low

Raw vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:L

Is it in your code?

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Read https://cve-list.com/agent/cve/CVE-2026-56661.md and follow it. Check whether this project is affected by CVE-2026-56661. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record