Bithumb says a hack of its internal mobile groupware system exposed the personal information of 844 customers, including names, phone numbers, email addresses, resident registration and driver's license numbers, bank account numbers, and copies of identification documents. Information belonging to 715 employees, including names and email addresses, was also exposed, and the exchange notified financial regulators, the Korea Internet & Security Agency, and the Personal Information Protection Commission after recognizing the incident.
Bithumb initially reported an employee information leak and later discovered that customer data had also been compromised while determining the scope of the breach.