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6.1
ProcessWire CMS: Authenticated Admins Can Access Internal Hosts
CVE-2026-40500
GHSA-gmwr-9j4p-96vm
Summary
A vulnerability in ProcessWire's admin panel allows authenticated administrators to access internal or external hosts by entering malicious URLs. This could lead to network scanning and access to sensitive information. Administrators should update ProcessWire to the latest version to fix this issue.
What to do
No fix is available yet. Check with your software vendor for updates.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| composer | processwire | processwire | <= 3.0.255 |
Original 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 a...
Original description
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.
nvd CVSS3.1
6.8
nvd CVSS4.0
6.1
Vulnerability type
CWE-918
Server-Side Request Forgery (SSRF)
- https://gist.github.com/thepiyushkumarshukla/7514e5eed526fd9d20fcfc42ce8d0a82
- https://processwire.com/
- https://www.vulncheck.com/advisories/processwire-cms-ssrf-via-add-module-from-ur...
- https://nvd.nist.gov/vuln/detail/CVE-2026-40500
- https://processwire.com
- https://github.com/advisories/GHSA-gmwr-9j4p-96vm
Published: 15 Apr 2026 · Updated: 17 Apr 2026 · First seen: 15 Apr 2026