When you click on the shop section it changes to the Https secure site but I can't claim I know anything about hacking, I assume it's safe, the only thing that might be reason for concern is that the shop uses the same account as the forum, it may be possible to get access to your account on the forum and then go to the shop, I've never ordered from cmon but usually even on secure sites stuff like credit card details are still blanked out so it's probably safe. It's weird that you suddenly got the warning though after years of being here