An attacker breached the servers of MetaM, Coinone’s outsourced customer support provider, on November 12, 2026 at around 4 a.m. local time. The intruder viewed or extracted records that may include names, contact details, passwords, bank account numbers, resident registration numbers, wallet addresses and transaction IDs. Only customers who used the support service were affected, while Coinone’s internal systems, trading platform and crypto wallets were not compromised. The exchange switched to email-only customer support and reported the incident to several South Korean regulators, including the Korea Internet & Security Agency and the Financial Supervisory Service. Affected customers face heightened risks of phishing and identity theft, prompting them in particular to change any passwords reused across other services.
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