Yes, other players in your Championship group can attack you and try to steal your medal, even if you are online. The game constantly checks the state of your car, even when you are editing it. This means that if you edit your car for too long, other players may catch you in the state when your car isn't ready. This can cause you to lose the medal. If this happens, just finish editing your car and fight with the opponent again.
Can I be attacked while I'm online?
Last Updated: 549d