Iframes are easily spoofable. I can generate an iframe, style it exactly like your authentication page, and trick users into entering their username/password in

Iframes are easily spoofable. I can generate an iframe, style it exactly like your authentication page, and trick users into entering their username/password into my phony form. This is why mature platforms use dedicated windows for logging in (Facebook, Twitter, Disqus). I'd recommend you consider making this change.