The reason why UwU Lend lost $19.4 million due to a hacker attack today is fundamentally due to the price oracle problem. Specifically, the pricing of sUSDe assets comes from the median of multiple sources. Among them, five of them, namely FRAXUSDe, USDeUSDC, USDeDAI, USDecrvUSD, and GHOUSDe, were manipulated during the hacker attack.