PT-2026-66666 · Google · Mcp-Toolbox

CVE-2026-14540 · Published 2026-07-31 · Updated 2026-07-31

Mitre

CVSS v4.0

8.0

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U

A Server-Side Request Forgery (SSRF) vulnerability exists in the generic HTTP source and tool components of Google mcp-toolbox versions 0.3.0 through 1.4.0. While the toolbox implements baseline input sanitization for user-controlled parameters, the underlying HTTP client (internal/sources/http/http.go) fails to safely regulate request redirection boundaries. Specifically, the client is initialized without a restrictive CheckRedirect policy hook and lacks target IP validation. An attacker or a malicious data-driven prompt can supply a crafted path parameter that triggers an open redirect or a direct destination swap on the target backend, coercing the mcp-toolbox into blindly following the redirection and making unauthorized requests to internal or arbitrary external endpoints.

Fix

SSRF

Weakness Enumeration

CWE-918

Related Identifiers

CVE-2026-14540

Affected Products

Mcp-Toolbox

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-14540 · Security Note
• https://github.com/googleapis/mcp-toolbox/pull/3448 · Note