Just a word up on behalf of the developers -- being a software engineer myself and having worked in cyber security -- you absolutely cannot make an online program safe from being attacked successfully due to the complexity that involves. You can only mitigate or reduce the chances and/or the effects.
There is a reason banks pump so much money into ongoing cyber security -- because as financial institutes they are prime targets and as such have to be on top of things or risk going out of business -- on the flip-side games like this tend not to get hit because there is just nothing to really be gained by doing so -- of course its summertime and as every administrator of a network or website knows -- cyber attacks increase during this time because folks that were in school and busy are now not in school and are looking for something to do and apparently hacking/attacking networks and websites is one of those idle past times.
So its not like it will not happen, and its not like you can develop a completely secure web-game. You can just do your best, and then try to close any open loopholes as they come up. Still you cannot close them all without making the system closed which kind of defeats the purpose of it being an online game. So relax, sit back and find another game to play for a while and check back here from time to time -- they will let us know when they got it fixed.