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Unrated severityNVD Advisory· Published Jul 31, 2026· Updated Jul 31, 2026

Authorization Bypass in MCP Toolbox Legacy HTTP Endpoints

CVE-2026-14537

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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Affected products

1

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Vulnerability mechanics

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