OAuth says nothing about authentication other than you have to be redirected back to the client once authentication is complete, by unspecified means, before the client can proceed with authorization and get a token proving they are now authorized to do something. There is no slippery slope.
OAuth says nothing about authentication other than you have to be redirected back to the client once authentication is complete, by unspecified means, before the client can proceed with authorization and get a token proving they are now authorized to do something. There is no slippery slope.