To be honest, I've never heard of Cashaa crypto exchange. Why would a person use a barely known exchange when there are multiple reputable ones out there? If an exchange is popular, there is a higher chance it will have a way better level of security. Plus, if it's reputable, there's a good chance the losses will be compensated to users (which is what happened with Binance a year or two ago). And what sort of exchange stores money on Blockchain rather than in a cold wallet?
What might be good news is that it seems that users won't be affected by the hack:
[quote link=https://cointelegraph.com/news/hacker-stole-336-btc-from-crypto-exchange-cashaa]
The company has stopped all the crypto-related transactions, however, prima facia users are not affected by this hack.
[/quote]