According to CoinMeta, South Korean cryptocurrency exchange Coinone has disclosed that a data breach occurred with its outsourced support service provider, which may have exposed users' passwords, identification numbers, and encrypted wallet addresses. In a notice on Sunday, Coinone stated that external attackers accessed servers operated by Metam around 4 a.m. on November 12 without authorization; Metam is responsible for handling customer inquiries. Coinone became aware of the incident around 9:20 a.m. on the same day after receiving a report from the contractor. The breach involved information provided by customers during telephone or online consultations; customers who did not contact the support center were not affected, and the number of individuals whose data was leaked has not yet been disclosed. The potentially leaked information includes names, phone numbers, email addresses, dates of birth, and bank account numbers. Coinone noted that the actual amount of information leaked may vary depending on what customers shared during the consultations. The company plans to contact customers individually or offer a special service for them to check their personal information that may have been compromised. Investigators are still determining the full extent of the intrusion and the information obtained from Metam's system. Coinone has reported this incident to the South Korean Internet and Security Agency and has strengthened monitoring of suspicious logins and transactions.