This post outlines the details of the exploit:
They've now announced that they're back up and running at full speed with no losses to user funds:
All services have resumed! Deposits & withdrawals are processing instantly for all currencies. We apologise for any inconvenience. 🙏
— Stake.com (@Stake) September 4, 2023
This isn't surprising considering how much money they make, but it's important to commend the team for making users whole and bringing things back to normal in a matter of hours. Imagine if we could have seen the same at FTX!