If you've got rogue software running on your machine, all bets are off.

Not necessarily. It could be running in a sandbox, or as unprivileged user, and accessing your app's API over localhost would allow for privilege escalation.

I see your point. But in my book, that's still rogue software. And that's a terrible sandbox. :)

I see your point, but you're saying:

> Yeah, we don't trust just anything that comes in on that socket

Well, you are, you're trusting it came from a browser so the Origin header is correct, right?