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.
CVSS 5EPSS 1.269%Risk 0.56
View source- Published
- 2026-06-28 02:16:32
- Affected versions
- <3.1.3
- Type
- Web application
- Vector
- CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L