Bithumb users face phishing risks after data breach reported Bithumb experienced a data breach on October 28 after unauthorized access to its internal tools affected customer's personal information. South Korea's Financial Supervisory Service (FSS) is investigating this incident along with similar violations at Daishin Securities and Mirae Asset Global Investment. Binance co-founder Changfeng Zhao advised users to improve their security measures, such as using unique email aliases and hardware keys, to protect against phishing attacks and SIM swapping following the leak.