Craft CMS up to 4.17.8/5.9.14 Host actionResourceJs server-side request forgery

Summaryinfo

A vulnerability, which was classified as critical, was found in Craft CMS up to 4.17.8/5.9.14. This issue affects the function actionResourceJs of the component Host Handler. The manipulation results in server-side request forgery. This vulnerability is identified as CVE-2026-41130. The attack can be executed remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Craft CMS up to 4.17.8/5.9.14. Affected is the function actionResourceJs of the component Host Handler. The manipulation with an unknown input leads to a server-side request forgery vulnerability. CWE is classifying the issue as CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-41130 since 04/17/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation needs additional levels of successful authentication. Technical details are known, but there is no available exploit.

Upgrading to version 4.17.9 or 5.9.15 eliminates this vulnerability. Applying the patch ebe7e85f1c89700d64332f72492be2e9a594e783 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Content Management System

Vendor

• Craft

Name

• CMS

Version

• 4.17.0
• 4.17.1
• 4.17.2
• 4.17.3
• 4.17.4
• 4.17.5
• 4.17.6
• 4.17.7
• 4.17.8
• 5.9.0
• 5.9.1
• 5.9.2
• 5.9.3
• 5.9.4
• 5.9.5
• 5.9.6
• 5.9.7
• 5.9.8
• 5.9.9
• 5.9.10
• 5.9.11
• 5.9.12
• 5.9.13
• 5.9.14

License

• free

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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