CVE-2026-40500
Server-Side Request Forgery in ProcessWire CMS Admin Module
Publication date: 2026-04-15
Last updated on: 2026-04-15
Assigner: VulnCheck
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| processwire | processwire | to 3.0.256 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-918 | The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability exists in ProcessWire CMS version 3.0.255 and earlier. It is a server-side request forgery (SSRF) issue found in the admin panel's 'Add Module From URL' feature. Authenticated administrators can provide arbitrary URLs to the module download parameter, which causes the server to make outbound HTTP requests to attacker-controlled internal or external hosts.
Attackers can exploit this behavior to perform internal network reconnaissance, such as port scanning and host enumeration within private IP ranges (RFC-1918). They may also gain potential access to sensitive cloud instance metadata endpoints by analyzing the different error messages returned by the server.
How can this vulnerability impact me? :
The vulnerability can allow attackers to conduct internal network port scanning and host enumeration, which can reveal sensitive network infrastructure details.
It may also enable attackers to access cloud instance metadata endpoints, potentially exposing sensitive configuration or credential information.
Since the vulnerability requires authenticated administrator access, the impact depends on the level of trust and security of administrator accounts.