Attacks and exploits have become very rampart these days as you hear of theft of coins and the likes. For this reason many exchanges have put in place strict security measures to prevent hackers.
Hackers on the other hand as seen hacking as a job and a very lucrative one at that. they are not only attacking exchanges alone but also email addresses associated with such exchanges.
So in order to protect your funds from been stolen always add an exra layer of protection like the 2 factor authentication and change your passwords as often as you can