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Advisories

Flowise - Custom MCP Environment Variable Denylist Bypass via Case Sensitivity

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severity
medium
date
Affecting

  • Flowise >= 0, < 3.1.3

CWE
  • CWE-178 Improper Handling of Case Sensitivity
CVSS
2.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
Credit
ashdfrkl
Description
Flowise before 3.1.3 validates Custom MCP stdio environment variables against a denylist using a case-sensitive comparison, so on Windows, where environment names are case-insensitive, supplying 'node_options' bypasses the NODE_OPTIONS denylist entry. An authenticated user who can configure a Custom MCP node can thereby inject NODE_OPTIONS --require and execute arbitrary code in the Flowise server context.

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