CVE-2026-41130
Description
Craft CMS is a content management system (CMS). In versions on the 4.x branch through 4.17.8 and the 5.x branch through 5.9.14, 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). Versions 4.17.9 and 5.9.15 patch the issue.
How to fix
- craftcms/cms5.9.15, 4.17.9 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| craftcms/cmsPackagist | 5.0.0-RC1 ≤ v < 5.9.15, 4.0.0-RC1 ≤ v < 4.17.9 | 5.9.15, 4.17.9 |
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