Flowise · Flowise · CVE-2025-71336
**Name of the Vulnerable Software and Affected Versions**
Flowise versions prior to 3.0.6
**Description**
The Custom MCP feature, used for executing OS commands like launching local MCP servers, is unsandboxed. Due to a minimal authentication and authorization model lacking role-based access control, and the fact that default installations may run without authentication if `FLOWISE USERNAME` and `FLOWISE PASSWORD` are not configured, an attacker can execute arbitrary OS commands. This is achieved by sending a crafted JSON payload with the header `x-request-from: internal` to the '/api/v1/node-load-method/customMCP' endpoint, potentially leading to a complete compromise of the platform container or server.
**Recommendations**
Update to version 3.0.6 or later.
Set the `FLOWISE USERNAME` and `FLOWISE PASSWORD` variables to enable authentication.
Restrict access to the '/api/v1/node-load-method/customMCP' endpoint.