Is this vulnerability remotely exploitable over the internet?

Yes, but it requires a valid authenticated FastGPT account with access to the MCP tools endpoints. Once authenticated, an attacker can send crafted requests over the internet to induce the server to contact internal resources.

What level of access does an attacker need to exploit this issue?

The attacker needs application-level authentication to invoke `/api/core/app/mcpTools/getTools` or `/api/core/app/mcpTools/runTool`. No direct network access to internal services is required; the application server issues the requests on the attacker's behalf.

What is the safest general fix pattern for developers?

Centralize all outbound HTTP request logic behind a shared component that always performs robust SSRF checks—such as private IP blocking, metadata endpoint blocking, and allowlisting—and ensure all endpoints, including MCP tools, use this component rather than constructing HTTP clients directly.

Severity:

HIGH RISK

(7.7)

Server-Side Request Forgery (CWE-918) in FastGPT MCP Tools Endpoints

CVE-2026-34163

Published:

Mar 31, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Server-Side Request Forgery (SSRF)

CWE:

CWE-918

Impact:

Internal network access and potential data exposure via SSRF

Severity:

HIGH RISK

(7.7)

CVSS Version:

3.1

Vulnerability Type

Category:

Server-Side Request Forgery (SSRF)

CWE:

CWE-918

Impact:

Internal network access and potential data exposure via SSRF

Severity:

HIGH RISK

(7.7)

CVSS Version:

3.1

Catch This CVE While Code Is Being Written

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Ask AI for summary of CodeAnt

Server-Side Request Forgery (CWE-918) in FastGPT MCP Tools Endpoints

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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