The OAuth servers I have developed have done like GitHub does [1] and at least confirm the redirect given during auth starts with the application-level URI. I t

The OAuth servers I have developed have done like GitHub does [1] and at least confirm the redirect given during auth starts with the application-level URI. I think it gives plenty of flexibility while still not openly redirecting. Edit: Or maybe I don't understand the flaw since it says GitHub is vulnerable... 1 - https://developer.github.com/v3/oauth/#redirect-urls https://developer.github.com/v3/oauth/#redirect-urls