I'm not surprised they don't say much about it if it's to fix an exploit. Not the kind of thing they want to advertise in case people try something similar etc.

It sucks that they have to fix it during peak play times but I guess it's more to do with when the devs are actually there. For me I'd rather have the maintenance at peak times than have it left longer and more people getting stung by a fault or getting an unfair advantage through an exploit.