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skinny-
Currently there is no problem. As long as you use strong passwords and keep them safe, and follow simple internet rules such as not blindly clicking on links asking you to reset passwords, you're ok. iCloud so far has not been hacked. People have been 'hacked' into revealing login information in one way or another.
JonD
Last time (and very likely the same this time) it was because of compromised passwords, usernames and security questions.
http://www.theverge.com/2014/9/2/6098107/apple-denies-icloud-breach-celebrity-nude-photo-hack