Medium severity6.8NVD Advisory· Published Apr 15, 2026· Updated May 1, 2026

CVE-2026-40500

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.

Affected packages

Versions sourced from the GitHub Security Advisory.

Package	Affected versions	Patched versions
processwire/processwirePackagist	<= 3.0.255	—

Patches

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

github.com/advisories/GHSA-gmwr-9j4p-96vmghsaADVISORY
nvd.nist.gov/vuln/detail/CVE-2026-40500ghsaADVISORY
gist.github.com/thepiyushkumarshukla/7514e5eed526fd9d20fcfc42ce8d0a82nvdWEB
processwire.comghsaWEB
www.vulncheck.com/advisories/processwire-cms-ssrf-via-add-module-from-urlnvdWEB
processwire.comnvd

News mentions

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cvss	0.442
epss	0.000
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000