modelcontextprotocol registry up to 1.7.5 Exchange Endpoint server-side request forgery

Summaryinfo

A vulnerability classified as critical was found in modelcontextprotocol registry up to 1.7.5. This affects an unknown part of the component Exchange Endpoint. The manipulation results in server-side request forgery. This vulnerability is cataloged as CVE-2026-44428. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical has been found in modelcontextprotocol registry up to 1.7.5. Affected is an unknown function of the component Exchange Endpoint. 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:

The MCP Registry provides MCP clients with a list of MCP servers, like an app store for MCP servers. Prior to 1.7.6, the client-side and server-side GitHub OIDC flow is bound only to a global audience string, not to the specific registry instance being targeted. On the client side, the publisher always appends audience=mcp-registry when requesting the GitHub Actions ID token, regardless of the selected --registry URL. On the server side, the exchange endpoint validates only that same fixed audience and then derives publish permissions directly from repository_owner. As a result, a token legitimately obtained while interacting with one registry deployment remains acceptable to any other deployment that shares the same code and audience string. This vulnerability is fixed in 1.7.6.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-44428 since 05/06/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The technical details are unknown and an exploit is not available.

Upgrading to version 1.7.6 eliminates this vulnerability.

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Productinfo

Vendor

• modelcontextprotocol

Name

• registry

Version

• 1.7.0
• 1.7.1
• 1.7.2
• 1.7.3
• 1.7.4
• 1.7.5

Website

• Product: https://github.com/modelcontextprotocol/registry/

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