CVE-2026-14537

CRITICAL

Authorization Bypass in MCP Toolbox Legacy HTTP Endpoints

Title source: cna

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.

References (1)

Core 1

Core References

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

Scores

CVSS v3 9.8

EPSS 0.0022

EPSS Percentile 12.2%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable yes

Technical Impact total

Details

CWE

CWE-863

Status published

Products (4)

Google/mcp-toolbox 1.3.0

Google/mcp-toolbox v1.4.0

google/mcp_toolbox_for_databases 1.3.0

google/mcp_toolbox_for_databases 1.4.0

Published Jul 31, 2026

Tracked Since Jul 31, 2026