CVE-2026-14537
Received Received - Intake

Incorrect Authorization in Google mcp-toolbox HTTP API

Publication date: 2026-07-31

Last updated on: 2026-07-31

Assigner: Google Inc.

Description
Incorrect Authorization in the direct HTTP API tool invocation endpoint in Google mcp-toolbox versions v1.3.0 and v1.4.0 allows an unauthenticated attacker to invoke tools protected by the scopeRequired feature via sending tool invocation requests through legacy HTTP endpoints when the --enable-api flag is active.

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Meta Information

Published
2026-07-31
Last Modified
2026-07-31
Generated
2026-07-31
AI Q&A
2026-07-31
EPSS Evaluated
N/A
NVD
CVE-2026-14537
EUVD
EUVD-2026-51371

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
google mcp-toolbox 1.3.0
google mcp-toolbox 1.4.0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-863 The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

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Executive Summary

This vulnerability is an Incorrect Authorization issue in Google mcp-toolbox versions v1.3.0 and v1.4.0. It allows an unauthenticated attacker to invoke tools that require specific authorization scopes by sending requests through legacy HTTP endpoints when the --enable-api flag is active.

Detection Guidance

This vulnerability allows unauthenticated tool invocation via legacy HTTP endpoints when --enable-api is active. To detect it, check for unexpected HTTP requests to direct API endpoints in mcp-toolbox logs or network traffic. Look for requests to endpoints that should require scopeRequired authorization but are being accessed without authentication.

Impact Analysis

An attacker could exploit this to perform unauthorized actions or access sensitive data by invoking protected tools without proper authentication or authorization, potentially leading to data breaches or system compromise.

Compliance Impact

This vulnerability could lead to unauthorized data access or processing, violating GDPR's data protection principles or HIPAA's security requirements for protected health information, potentially resulting in legal penalties or compliance failures.

Mitigation Strategies

Immediately upgrade mcp-toolbox to a version that is not affected by this vulnerability. Disable the --enable-api flag if it is currently active. Review and restrict access to legacy HTTP endpoints to prevent unauthorized tool invocations.

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