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CVE-2026-11624 — Vulnerability in...

CRITICAL

MCP Toolbox for Databases has an Origin Validation Error

Published June 13, 2026Updated September 10, 2026Source: osv

Summary

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.

Advisory Timeline

  • First published June 13, 2026 (121 days ago).
  • Last revised September 10, 2026 — 89 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Go
Update github.com/googleapis/mcp-toolbox to 0.25.0 or later
go get github.com/googleapis/mcp-toolbox@v0.25.0

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: go (1).

PackageEcosystemAffectedFixed In
github.com/googleapis/mcp-toolbox
go
All versions0.25.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-346
    Origin Validation ErrorMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.1 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
A
Scope
—
Confidentiality
—
Integrity
—
Availability
—

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

Frequently Asked Questions

What is CVE-2026-11624?
MCP Toolbox for Databases has an Origin Validation Error This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.1/10).
How do I check if my project is affected by CVE-2026-11624?
CVE-2026-11624 affects github.com/googleapis/mcp-toolbox. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-11624 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.1

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-76g7-m3xw-x9gr
GO-2026-6288

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