CVE-2026-41130: Craft CMS has a host header injection leading to SSRF via resource-js endpoint

April 14, 2026 (updated April 24, 2026)

The resource-js endpoint in Craft CMS allows unauthenticated requests to proxy remote JavaScript resources. When trustedHosts is not explicitly restricted (default configuration), the application trusts the client-supplied Host header.

This allows an attacker to control the derived baseUrl, which is used in prefix validation inside actionResourceJs(). By supplying a malicious Host header, the attacker can make the server issue arbitrary HTTP requests, leading to Server-Side Request Forgery (SSRF).

References

Code Behaviors & Features

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