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AI agent vulnerability · Other MCP servers and tools

CVE-2026-11624: MCP Toolbox for Databases has an Origin Validation Error

criticalCVSS 4.0 9.4GHSA-76g7-m3xw-x9gr

The Model Context Protocol has a security warning advising servers to validate the "Origin" header on all incoming connections to prevent DNS rebinding attacks. Prior to the v0.25.0 release, users had no way to validate the origin's host. In v0.25.0, a new "--allowed-hosts" flag was introduced alongside the existing "--allowed-origins" flag, enabling users to specify permitted hosts at server startup.

Published Jun 13, 2026 · Updated Aug 24, 2026

Affected packages

github.com/googleapis/mcp-toolbox

Ecosystem
Go
Affected
< 0.25.0
Fixed in
0.25.0
Check
go list -m github.com/googleapis/mcp-toolbox

Advisory details

From the GitHub Advisory Database (CC BY 4.0).

The Model Context Protocol has a security warning advising servers to validate the "Origin" header on all incoming connections to prevent DNS rebinding attacks. Prior to the v0.25.0 release, users had no way to validate the origin's host. In v0.25.0, a new "--allowed-hosts" flag was introduced alongside the existing "--allowed-origins" flag, enabling users to specify permitted hosts at server startup. Both flags default to "*", allowing users to implement strict access controls as needed without breaking existing setups. If either flag is set to "*", the server will output a startup warning about potential vulnerabilities. Documentation has also been updated to highlight these security considerations.

References

How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology

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