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CVE-2026-14537 | Mondoo Vulnerability Intelligence

Vulnerability IntelligenceCVE-2026-14537

CVE-2026-14537

CRITICAL9.8

Authorization Bypass in MCP Toolbox Legacy HTTP Endpoints

Published Jul 31, 2026

Modified 3 weeks ago

Details

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

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

https://www.cve.org/CVERecord?id=CVE-2026-14537

CVSS Analysis

CVSS v4.0

8.1

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

LowAC:L

Attack Requirements

NoneAT:N

Privileges Required

NonePR:N

User Interaction

NoneUI:N

Vulnerable System

Vuln. Confidentiality

HighVC:H

Vuln. Integrity

HighVI:H

Vuln. Availability

HighVA:H

Subsequent System

Subseq. Confidentiality

NoneSC:N

Subseq. Integrity

NoneSI:N

Subseq. Availability

NoneSA:N

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

Weakness Type (CWE)

Access Control

Incorrect Authorization

Ecosystems

Timeline

PublishedJul 31, 2026

ModifiedJul 31, 2026