---
id: CVE-2026-40500
title: >-
  ProcessWire CMS version 3.0.255 and prior contain a server-side request
  forgery vulnerability in the admin panel's 'Add Module From URL' feature that
  allows authenticated administrators to supply arbitrary URLs to the module
  download par…
summary: >-
  ProcessWire CMS version 3.0.255 and prior contain a server-side request
  forgery vulnerability in the admin panel's 'Add Module From URL' feature that
  allows authenticated administrators to supply arbitrary URLs to the module
  download par…
severity: medium
cvss: 6.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N'
cwe:
  - CWE-918
published: '2026-04-15'
updated: '2026-07-07'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-40500'
references:
  - url: >-
      https://gist.github.com/thepiyushkumarshukla/7514e5eed526fd9d20fcfc42ce8d0a82
    label: disclosure@vulncheck.com
  - url: 'https://processwire.com/'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/processwire-cms-ssrf-via-add-module-from-url
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00385
epssPercentile: 0.30533
ingestedAt: '2026-07-07T19:42:41.433Z'
---

## Overview

ProcessWire CMS version 3.0.255 and prior contain a server-side request forgery vulnerability in the admin panel's 'Add Module From URL' feature that allows authenticated administrators to supply arbitrary URLs to the module download parameter, causing the server to issue outbound HTTP requests to attacker-controlled internal or external hosts. Attackers can exploit differentiable error messages returned by the server to perform reliable internal network port scanning, host enumeration across RFC-1918 ranges, and potential access to cloud instance metadata endpoints.

## Remediation

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