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Mirae Asset Securities confirmed on Saturday that hackers breached its systems, leaking personal information of some 39,000 customers and employees, Yonhap and the Korea Times report. The breach hit the mobile web phone-authentication login service and the groupware system 'mi-global' on Nov. 4-5, exposing account numbers of about 3,800 customers and personal data of 35,255 current and former employees, including retirees and outsourced workers, according to the Kyunghyang Shinmun and Dong-A Ilbo. The securities firm said it detected abnormal access on Nov. 4 and is assessing the damage, with the incident adding to a wave of cyberattacks on South Korea's financial sector, KBS World reports. Korean media emphasize the scale and sensitivity of the leak, with the Hankyung noting the breach follows similar incidents across the financial industry, while Dong-A Ilbo highlights that the phone-authentication login was the entry point.