Next time I want to play an Ubisoft game I'm just going to pirate it.
EDIT: I buy 99% of my video games through Steam, and when the games I get through Steam want to use their own launcher (play, windows live games, or EA's Origin, for example) I always get peeved.. to find out it allows arbitrary remote code execution is absolutely infuriating.
EDIT: Oh, btw, I'm using Opera 12.
EDIT: Protect yourself (in Opera, at least) by going to Settings -> Preferences(menu option) -> Advanced(Tab) -> Downloads(left menu bar) -> Search for "uplay" and delete the associated row.