CVE-2026-14540 – Server-Side Request Forgery via Unrestricted HTTP Redirection in MCP Toolbox

CVE ID :CVE-2026-14540

Published : July 31, 2026, 2:16 a.m. | 1 hour, 29 minutes ago

Description :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.

Severity: 8.0 | HIGH

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