---
title: "CVE-2026-18424: Concrete CMS - Server-Side Request Forgery"
description: "Concrete CMS 9.0.0 to 9.5.2 contains a server-side request forgery caused by cross-port reuse of a host's validated DNS pin in remote file import, letting low-privileged authenticated users access internal resources, exploit requires authenticated file import permission."
url: https://panop.io/threat-heartbeat/CVE-2026-18424/
---

# CVE-2026-18424 Concrete CMS - Server-Side Request Forgery

Concrete CMS 9.0.0 to 9.5.2 contains a server-side request forgery caused by cross-port reuse of a host's validated DNS pin in remote file import, letting low-privileged authenticated users access internal resources, exploit requires authenticated file import permission.

CVSS base score 7.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.24% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-18424)

## Details

Type

Server-Side Request Forgery

Impact

Server Side Request Forgery, Information Disclosure

CVSS vector

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

Published

15 September 2026

Updated

15 October 2026

Weakness

[CWE-918](https://cwe.mitre.org/data/definitions/918.html)

## Vendor fix

Update to a version later than 9.5.2 or the latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-18424](https://nvd.nist.gov/vuln/detail/CVE-2026-18424)
- [https://documentation.concretecms.org/developers/introduction/version-history/953-release-notes](https://documentation.concretecms.org/developers/introduction/version-history/953-release-notes)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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