Vulnerability · Published Jul 31, 2026 · Assigned by Google
CVE-2026-14537Authorization Bypass in MCP Toolbox Legacy HTTP Endpoints
High 8.1
In plain English
A high-severity incorrect authorization in mcp-toolbox from Google. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities).
Severity (CVSS 4.0)8.1High
Exploit odds (30 days)0.3%top 83.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| mcp-toolbox | 1.3.0v1.4.0 |
Weakness: CWE-863 · Vector: 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