Craft CMS up to 4.17.8/5.9.14 GraphQL Schema server-side request forgery

Summaryinfo

A vulnerability has been found in Craft CMS up to 4.17.8/5.9.14 and classified as critical. Impacted is an unknown function of the component GraphQL Schema Handler. This manipulation causes server-side request forgery. This vulnerability is tracked as CVE-2026-41129. The attack is possible to be carried out remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability has been found in Craft CMS up to 4.17.8/5.9.14 and classified as critical. Affected by this vulnerability is an unknown part of the component GraphQL Schema Handler. The manipulation with an unknown input leads to a server-side request forgery vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Craft CMS is a content management system (CMS). Versions on the 4.x branch through 4.17.8 and the 5.x branch through 5.9.14 are vulnerable to Server-Side Request Forgery. The exploitation requires a few permissions to be enabled in the used GraphQL schema: "Edit assets in the volume" and "Create assets in the volume." Versions 4.17.9 and 5.9.15 patch the issue.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-41129 since 04/17/2026. The exploitation appears to be easy. The attack can be launched remotely. Additional levels of successful authentication are required for exploitation. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 4.17.9 or 5.9.15 eliminates this vulnerability. Applying the patch d20aecfaa0eae076c4154be3b17e1f9fa05ce46f 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.

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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

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CPE 2.2info

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