Rapid7

module

Flowise JS Injection RCE

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Disclosed
Sep 13, 2025
Created
Nov 22, 2025

Description

This module exploits a remote code execution vulnerability in Flowise versions >= 2.2.7-patch.1
and located in packages/components/nodes/tools/MCP/CustomMCP/CustomMCP.ts, which allows users to execute
arbitrary commands via JavaScript code injection in the mcpServerConfig parameter using the
convertToValidJSONString function that uses Function('return ' + inputString)(). For versions
the exploit can work unauthenticated if FLOWISE_USERNAME and FLOWISE_PASSWORD environment variables
are not configured. For versions >= 3.0.1, authentication via FLOWISE_EMAIL and FLOWISE_PASSWORD is
required due to JWT token verification.

Authors

Kim SooHyun (im-soohyun)
nltt0
Valentin Lobstein [email protected]

Platform

Linux,Unix,Windows

Architectures

cmd

References

Module Options

To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':


    msf > use exploit/multi/http/flowise_js_rce
    msf exploit(flowise_js_rce) > show targets
        ...targets...
    msf exploit(flowise_js_rce) > set TARGET < target-id >
    msf exploit(flowise_js_rce) > show options
        ...show and set options...
    msf exploit(flowise_js_rce) > exploit
Title
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