CVE-2026-73601

Summary

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.

Affected Software

VendorProductVersion RangeStatus
FlowiseAIFlowise0 < 3.1.3affected
FlowiseAIFlowise3.1.3unaffected
FlowiseAIFlowise0 < 3.1.3affected
FlowiseAIFlowise3.1.3unaffected

Weaknesses

  • CWE-95: Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')

References