CVE-2026-41130 Craft CMS has a host header injection leading to SSRF via resource-js endpoint
Unauthenticated attackers can exploit Host header injection in Craft CMS to perform Server-Side Request Forgery via the resource-js endpoint.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-41130?
CVE-2026-41130 is a medium-severity server-side request forgery vulnerability in craftcms cms, published on 21 Apr 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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.
Weakness: CWE-918
Which versions are affected by CVE-2026-41130?
4 open source packages ship an affected version, including craftcms/cms.
| Package | Affected | Fixed in |
|---|---|---|
craftcms/cms Packagist | From 4.0.0-RC1 | 4.17.9 |
craftcms/cms Packagist | From 4.0.0-RC1 | 4.17.9 |
craftcms/cms Packagist | From 5.0.0-RC1 | 5.9.15 |
craftcms/cms Packagist | From 5.0.0-RC1 | 5.9.15 |
How do I fix CVE-2026-41130?
Upgrade craftcms/cms to a fixed version for your release line: 4.17.9 or 5.9.15.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-41130 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-41130 exists.
Sources
Also known as GHSA-95wr-3f2v-v2wh.