Server-Side Request Forgery in ProcessWire CMS by ProcessWire
CVE-2026-40500

6.1MEDIUM

Key Information:

Vendor

Processwire

Status
Processwire
Vendor
CVE Published:
15 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-40500?

The ProcessWire CMS versions 3.0.255 and earlier are susceptible to a server-side request forgery (SSRF) vulnerability found in the admin panel's 'Add Module From URL' feature. Authenticated administrators can input arbitrary URLs in the module download parameter, resulting in the server making unauthorized outbound HTTP requests to both internal and external locations controlled by attackers. This vulnerability allows adversaries to conduct detailed internal network port scans, enumerate hosts within private IP address ranges (RFC-1918), and potentially gain access to sensitive cloud instance metadata endpoints.

Affected Version(s)

processwire 0 <= 3.0.255

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-40500 - Proof of Concept

References

https://gist.github.com/thepiyushkumarshukla/7514e5eed526...
technical-descriptionexploit
https://processwire.com/
product
https://www.vulncheck.com/advisories/processwire-cms-ssrf...
third-party-advisory

CVSS V4

Score:
6.1
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Piyush Kumar Shukla
.