CVE-2026-73601 — Flowise before 3.1.3 Remote Code Execution via Custom MCP
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 exec…
Published: 2026-08-13 · CVSS: 9.0 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7