According to its official statement released on October 29, Bithumb revealed that an internal mobile collaboration system used for employee operations experienced unauthorized external access on October 27, resulting in personal information disclosure for approximately 600 employees and contractors. The exchange stated the system is separated from its main trading network and customer crypto assets remained secure.

Meanwhile, security investments among major South Korean exchanges have surged significantly in 2025. Bithumb increased its information security budget by 16.2% year-over-year to 12.37 billion Korean won, with dedicated security personnel growing from 31.8 to 42.2 staff members. Dunamu, operator of Upbit, expanded security spending by 64.7% to 24.34 billion Korean won and increased security staff from 33.6 to 43.9 personnel.

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