Incorrect Authorization Vulnerability in Google MCP-Toolbox
CVE-2026-14537

8.1HIGH

Key Information:

Vendor

Google
Status
Mcp-toolbox
Vendor
CVE Published:
31 July 2026

What is CVE-2026-14537?

An incorrect authorization vulnerability exists in the MCP-Toolbox, specifically within the direct HTTP API tool invocation endpoint. This flaw allows unauthenticated attackers to invoke tools that are typically secured by the 'scopeRequired' feature. By exploiting legacy HTTP endpoints while the '--enable-api' flag is activated, attackers can bypass intended access controls and potentially execute unauthorized operations.

Affected Version(s)

mcp-toolbox 1.3.0

mcp-toolbox v1.4.0

References

https://github.com/googleapis/mcp-toolbox/pull/3435

CVSS V4

Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

HE WEI (ギカク)
David Carliez
.