CVE-2026-11624

Severity: critical (CVSS 9.4 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-13 · updated 2026-07-23
Weakness: CWE-346

Description

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.

Affected products

Google MCP Toolbox for Databases (googleapis/mcp-toolbox): before 0.25.0 — fixed in 0.25.0

How to fix

Upgrade to a fixed version: Google MCP Toolbox for Databases (googleapis/mcp-toolbox) 0.25.0. Check the vendor advisory for mitigations.

References

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