CVE-2026-14537

Authorization Bypass in MCP Toolbox Legacy HTTP Endpoints

State: Published
Severity: 8.1 High
Published: Jul 31, 2026
Updated: Jul 31, 2026
Reserved: Jul 3, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	8.1 High	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	Google

Weaknesses

CWE-863 (Incorrect Authorization)

Affected Products

Product	Versions
mcp-toolboxGoogle	1.3.0Affected v1.4.0Affected

References

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

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