CVE-2026-14540— Server-Side Request Forgery via Unrestricted HTTP Redirection in MCP Toolbox
Possible ATT&CK Techniques 1AI
T1598.001 · Spearphishing ServiceAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| mcp-toolbox | 0.3.0≤ 1.4.0 | affected |
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I. Basic Information for CVE-2026-14540
Vulnerability Information
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Vulnerability Title
Server-Side Request Forgery via Unrestricted HTTP Redirection in MCP Toolbox
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| mcp-toolbox | 0.3.0 ~ 1.4.0 | - |
II. Public POCs for CVE-2026-14540
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
Qwen3.6-35B-A3B · 11051 chars
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III. Intelligence Information for CVE-2026-14540
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Patches & Fixes for CVE-2026-14540 (1)
Same Patch Batch · Google · 2026-07-31 · 5 CVEs total
| CVE-2026-14537 | 8.1 HIGH | Authorization Bypass in MCP Toolbox Legacy HTTP Endpoints |
| CVE-2026-14541 | 8.0 HIGH | Authentication Bypass and Audience Confusion in MCP Toolbox OAuth Provider |
| CVE-2026-14539 | 6.6 MEDIUM | Denial of Service via Unrestricted Payload Buffering in MCP Toolbox |
| CVE-2026-14538 | 5.7 MEDIUM | BigQuery Dataset Allowlist Bypass via Metadata Dry-Run in MCP Toolbox |
IV. Related Vulnerabilities
Same product: mcp-toolbox
Same vendor: Google
- CVE-2026-14541
Authentication Bypass and Audience Confusion in MCP Toolbox - CVE-2026-14539
Denial of Service via Unrestricted Payload Buffering in MCP - CVE-2026-14538
BigQuery Dataset Allowlist Bypass via Metadata Dry-Run in MC - CVE-2026-14537
Authorization Bypass in MCP Toolbox Legacy HTTP Endpoints - CVE-2026-18019
Google Chrome 侧信道信息泄露漏洞
Same weakness: CWE-918
- CVE-2026-69078
Server-Side Request Forgery and Local File Disclosure in CTI - CVE-2026-67311
Budibase before 3.38.1 SSRF Blacklist Bypass via HTTP Redire - CVE-2026-53500
Thumbor treats ALLOWED_SOURCES string patterns as unescaped - CVE-2026-57232
Contao: Server-Side Request Forgery (SSRF) via Unvalidated R - CVE-2026-54725
vault-addr annotation SSRF -- webhook makes outbound HTTP ca
V. Comments for CVE-2026-14540
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