South Korean crypto exchange Coinone confirmed a data breach at its outsourced customer service provider on Sunday, November 15, 2026. Attackers broke into the servers of MetaM, the company that handles Coinone's chat and phone enquiries. Any customer who has ever contacted support may be affected, and depending on the conversation the data include passwords, bank account numbers and the Korean resident registration number. The exchange itself says it has seen no sign that accounts, trading or wallets were attacked.
For investors in Europe, Coinone is not a common trading venue. The case is instructive nonetheless, because it shows a pattern that also affects European exchanges: the target is neither the blockchain nor the exchange itself, but a service provider where conversation logs with sensitive details pile up over years. Those logs then become the raw material for especially convincing scams.
Coinone data breach: what happened at service provider MetaM
According to Coinone, as reported by the daily Hankook Ilbo and the business paper Financial News among others, an external attacker a...
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