South Korean cryptocurrency exchange Coinone has announced a data breach resulting from a hack of its contractor, MetaM. Cybercriminals accessed customer support records, potentially exposing sensitive information such as names, phone numbers, banking details, document information, passwords, and cryptocurrency wallet addresses. The total number of affected individuals has not been disclosed. Coinone stated that there are no signs of a breach in its own systems. However, the exchange has issued a warning about the risks of phishing and the misuse of stolen data to impersonate clients. Users who shared their passwords during support interactions have been advised to change them immediately.