Coinone says customer service data breached via vendor MetaM

The exposure of resident registration numbers and bank account details, not just contact data, makes this a far more serious leak than a typical names-and-emails breach, and it lands through a third-party vendor rather than the exchange's own perimeter — a reminder that outsourced support desks are a soft entry point across Korean crypto. The claim that trading and wallet systems were untouched is the reassuring part, but it rests on the exchange's own review as of Nov. 15, not an independent audit. Worth watching is whether the vendor's access scope was wider than disclosed and whether the mandatory two-factor shift becomes permanent.