GHSA-95wr-3f2v-v2wh
Medium · 5.5Craft CMS has a host header injection leading to SSRF via resource-js endpoint
CVSS
5.5
EPSS
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Published
Apr 14, 2026
CISA due date
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The record
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).
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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