"The transaction was manipulated by a sophisticated attack that altered the smart contract logic and masked the signing interface, enabling the attacker to gain control of the ETH cold wallet. As a result, over 400,000 ETH and stETH worth more than $1.5 billion were transferred to an unidentified address."
This is not unique to crypto but whenever I see an attack described as "sophisticated" I read it as "oh yes, we didn't think of that".