apollographql apollo-mcp-server up to 1.6.x Model Context Protocol origin validation

Summaryinfo

A vulnerability, which was classified as problematic, was found in apollographql apollo-mcp-server up to 1.6.x. Impacted is an unknown function of the component Model Context Protocol. Executing a manipulation can lead to origin validation. This vulnerability is registered as CVE-2026-35577. It is possible to launch the attack remotely. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in apollographql apollo-mcp-server up to 1.6.x. This vulnerability affects some unknown functionality of the component Model Context Protocol. The manipulation with an unknown input leads to a origin validation vulnerability. The CWE definition for the vulnerability is CWE-346. The product does not properly verify that the source of data or communication is valid. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Apollo MCP Server is a Model Context Protocol server that exposes GraphQL operations as MCP tools. Prior to version 1.7.0, the Apollo MCP Server did not validate the Host header on incoming HTTP requests when using StreamableHTTP transport. In configurations where an HTTP-based MCP server is run on localhost without additional authentication or network-level controls, this could potentially allow a malicious website—visited by a user running the server locally—to use DNS rebinding techniques to bypass same-origin policy restrictions and issue requests to the local MCP server. If successfully exploited, this could allow an attacker to invoke tools or access resources exposed by the MCP server on behalf of the local user. This issue is limited to HTTP-based transport modes (StreamableHTTP). It does not affect servers using stdio transport. The practical risk is further reduced in deployments that use authentication, network-level access controls, or are not bound to localhost. This vulnerability is fixed in 1.7.0.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-35577 since 04/03/2026. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available.

Upgrading to version 1.7.0 eliminates this vulnerability.

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Productinfo

Type

• Artificial Intelligence Software

Vendor

• apollographql

Name

• apollo-mcp-server

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6

Website

• Product: https://github.com/apollographql/apollo-mcp-server/

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