CVE-2026-14537

HIGH

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 v4 8.1

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Details

CWE

CWE-863

Status published

Products (2)

Google/mcp-toolbox 1.3.0

Google/mcp-toolbox v1.4.0

Published Jul 31, 2026

Tracked Since Jul 31, 2026