CVE-2026-11624 | The Model Context Protocol has a security warning advising s… | CVSS 9.4 CRITICAL

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.

Metadata

CVE ID: CVE-2026-11624
State: PUBLISHED
Assigner: Google
Reserved: 2026-06-08 20:57 UTC
Published: 2026-06-13 08:38 UTC
Last updated: 2026-06-13 08:38 UTC
Primary CWE: CWE-346
CWE-346: Origin Validation Error
Vendor / Product: Google / MCP Toolbox for Databases
Sources: cve.org · NVD

Severity & Metrics

9.4 CRITICAL CVSS 4.0

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Affected products (1)

Vendor	Product	Platform	Versions
Google	MCP Toolbox for Databases	—	0 < 0.25.0

Weakness (CWE)

CWE	Source	Description
CWE-346	cna	CWE-346: Origin Validation Error

CVSS scores (1)

Score	Severity	Version	Source	Vector
9.4	CRITICAL	4.0	cna	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

References (2)