CVE-2026-14540 (GCVE-0-2026-14540)

Vulnerability from cvelistv5 – Published: 2026-07-31 01:46 – Updated: 2026-07-31 16:12
VLAI
Title
Server-Side Request Forgery via Unrestricted HTTP Redirection in MCP Toolbox
Summary
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 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-31 16:12 UTC
CWE
  • CWE-918 - (Server-Side Request Forgery (SSRF))
Assigner
Google CNA under the Google root
CNA scorecard B 77/100 over 39 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Google mcp-toolbox Affected: 0.3.0 , ≤ 1.4.0 (semver)
guessed Create a notification for this product.
Credits
Syed Anas Mohiuddin
Show details on NVD website
To clipboard 

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