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CVE-2026-34163— Server-Side Request Forgery via MCP Tools Endpoint in FastGPT

Quick assessment

Affected
labring FastGPT
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 7.7 · High EPSS 0.42% · P34

Possible ATT&CK Techniques 1 AI

T1001 · Data Obfuscation
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
labring FastGPT < 4.14.9.5 -

II. Public POCs for CVE-2026-34163

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9005 chars
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III. Intelligence Information for CVE-2026-34163

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Patches & Fixes for CVE-2026-34163 (1)

Vendor Advisories for CVE-2026-34163 (1)

IV. Related Vulnerabilities

Same product: FastGPT
Same vendor: labring
Same weakness: CWE-918

V. Comments for CVE-2026-34163

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