CVE WatchOct 23, 2026

CVE-2026-14540

A Server-Side Request Forgery (SSRF) vulnerability exists in the generic HTTP source and tool components of Google mcp-toolbox versions 0.3.

CVSS

6.1

Medium

EPSS

0.1%

KEV

—

Exploit Today

0-100

Published: Jul 31, 2026 · Last modified: Oct 23, 2026 · CWE-918

EPSS · 30d

0.1%EPSS · 30 days0.1%

2026-09-282026-10-25

Technical 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.

Official references

github.comhttps://github.com/googleapis/mcp-toolbox/pull/3448

Related CVEs

CVECVSSEPSSKEVRExploitTitleMod.

CVE-2026-1168276.8 MED

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