What is CVE-2026-14537?

CVE-2026-14537 is a critical-severity vulnerability in Google Mcp-Toolbox, classified under Incorrect Authorization. CVSS score: 9.8/10. Published 2026-07-31.

How severe is CVE-2026-14537?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Google Mcp-Toolbox

CVE-2026-14537

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.

Vulnerability class: Broken Access Control

EPSS: 0.002 (12.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Google Mcp-toolbox — versions 1.3.0, v1.4.0
Google Mcp_toolbox_for_databases — versions 1.3.0, 1.4.0

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

cve-coordination@google.com (Patch, Issue Tracking)

Frequently asked questions

What is CVE-2026-14537?: CVE-2026-14537 is a critical-severity vulnerability in Google Mcp-Toolbox, classified under Incorrect Authorization. CVSS score: 9.8/10. Published 2026-07-31.
How severe is CVE-2026-14537?: Critical severity. CVSS v3 base score is 9.8 out of 10.