Feature Request: Built-in User Authentication / Password Protection for Web UI

### Feature Idea

Is your feature request related to a problem? Please describe.

Currently, when running ComfyUI with remote access enabled (e.g., using the --listen flag or running on a publicly accessible server), the web interface is accessible to anyone who knows the IP and port, as there is no built-in mechanism for user authentication or password protection. This poses a significant security risk for users who host their instance on a shared network or cloud environment.

Describe the solution you'd like

I propose adding a built-in, optional user authentication feature to the ComfyUI core. This could be implemented via:

Command-line arguments: E.g., --username and --password .

Configuration file: Allowing users to define one or more user accounts.

The feature should require users to enter credentials before accessing the main workflow interface.

### Existing Solutions

Currently, the recommended workaround is to use a reverse proxy (like Nginx or Caddy) to implement basic HTTP authentication. While effective, this requires additional software setup and technical knowledge, making it a barrier for less experienced users who simply need basic access control. A built-in feature would greatly simplify deployment and enhance security out of the box.

### Other

Implementing this would greatly improve the security and usability of ComfyUI for users running instances outside of a strictly local environment. Thank you for considering this feature!

Start by tracing how ComfyUI exposes the web interface when launched with --listen; the issue names no repository files or tests. Compare the requested built-in access control with the existing Nginx or Caddy workaround. Done would require an agreed optional authentication design, credential configuration, protected web access, and coverage for the relevant access paths.

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