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VulnerabilityTitle and contextCVSSEPSSPoCsSignals

Google MCP Toolbox for Databases Origin Validation Bypass via DNS Rebinding

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…

CWE-346Jun 13, 2026
CVSS9.4v4.0EPSS0.153%PoCs0SignalsSTIX

MCP Toolbox for Databases vulnerable to DNS rebinding attacks

Vulnerable to DNS rebinding attacks when using SSE (http://b/499408790). During the beta phase, we implemented `allowed-origins` and `allowed-hosts` flags to align with MCP security guidelines. However, the hardcoded `Access-Control-Allow-Origin: *` header in the SSE initialization handler was inadvertently retained. This vulnerability specifically impacts users connecting via Toolbox using SSE under specification v2024-11-05.

CWE-942May 27, 2026
CVSS9.4v4.0EPSS0.279%PoCs0SignalsSTIX