CVE-2026-34163— Server-Side Request Forgery via MCP Tools Endpoint in FastGPT
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I. Basic Information for CVE-2026-34163
Vulnerability Information
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Vulnerability Title
Server-Side Request Forgery via MCP Tools Endpoint in FastGPT
Source: NVD (National Vulnerability Database)
Vulnerability Description
FastGPT is an AI Agent building platform. Prior to version 4.14.9.5, FastGPT's MCP (Model Context Protocol) tools endpoints (/api/core/app/mcpTools/getTools and /api/core/app/mcpTools/runTool) accept a user-supplied URL parameter and make server-side HTTP requests to it without validating whether the URL points to an internal/private network address. Although the application has a dedicated isInternalAddress() function for SSRF protection (used in other endpoints like the HTTP workflow node), the MCP tools endpoints do not call this function. An authenticated attacker can use these endpoints to scan internal networks, access cloud metadata services, and interact with internal services such as MongoDB and Redis. This issue has been patched in version 4.14.9.5.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
服务端请求伪造(SSRF)
Source: NVD (National Vulnerability Database)
Vulnerability Title
FastGPT 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FastGPT是labring开源的一款基于大语言模型的开源知识库问答系统。 FastGPT 4.14.9.5之前版本存在代码问题漏洞，该漏洞源于FastGPT的MCP工具端点/api/core/app/mcpTools/getTools和/api/core/app/mcpTools/runTool接受用户提供的URL参数并对其进行服务器端HTTP请求，但未验证URL是否指向内部/私有网络地址，可能导致经过身份验证的攻击者扫描内部网络、访问云元数据服务并与内部服务交互。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-34163
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
Qwen3.6-35B-A3B · 9005 chars
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III. Intelligence Information for CVE-2026-34163
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IV. Related Vulnerabilities
Same product: FastGPT
- CVE-2026-44286
FastGPT: SSRF Vulnerability in Laf Workflow Node via Missing - CVE-2026-44284
FastGPT: Stored MCP tool URL SSRF in FastGPT workflow execut - CVE-2026-42345
FastGPT: Cloud metadata endpoint SSRF protection bypass via - CVE-2026-42344
FastGPT: DNS rebinding TOCTOU bypass in isInternalAddress al - CVE-2026-42343
FastGPT: Uncontrolled Resource Consumption leading to Sandbo
Same vendor: labring
- CVE-2026-44286
FastGPT: SSRF Vulnerability in Laf Workflow Node via Missing - CVE-2026-44284
FastGPT: Stored MCP tool URL SSRF in FastGPT workflow execut - CVE-2026-42345
FastGPT: Cloud metadata endpoint SSRF protection bypass via - CVE-2026-42344
FastGPT: DNS rebinding TOCTOU bypass in isInternalAddress al - CVE-2026-42343
FastGPT: Uncontrolled Resource Consumption leading to Sandbo
Same weakness: CWE-918
- CVE-2026-8193
Akaunting Invoice PDF Rendering dompdf.php server-side reque - CVE-2026-44313
LinkWarden: Server-Side Request Forgery (SSRF) in Link Creat - CVE-2026-42352
pygeoapi 0.23.x: Unauthenticated SSRF via OGC API - Processe - CVE-2026-42346
Postiz: TOCTOU DNS rebinding bypasses all SSRF URL validatio - CVE-2026-42339
New API: SSRF Filter Bypass via 0.0.0.0
V. Comments for CVE-2026-34163
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