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Advisories

Flowise before 3.1.3 Remote Code Execution via Custom MCP

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severity
critical
date
Affecting

  • Flowise >= 0, < 3.1.3

  • Flowise >= 0, < 3.1.3

CWE
  • CWE-95 Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')
CVSS
9.0
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Credit
alex-elttam
Description
Flowise versions before 3.1.3 contain a remote code execution vulnerability in the Custom MCP node when CUSTOM_MCP_PROTOCOL is set to stdio, allowing authenticated users to execute arbitrary commands by manipulating environment variables and command arguments. Attackers can abuse PYTHONWARNINGS and BROWSER environment variables with python3, or leverage the root working directory with node to bypass validation and execute system commands.

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