Bithumb reports data breach amid South Korea cyberattacks

Bithumb reported a breach of its internal employee system as South Korean financial firms faced cyberattacks, according to Yonhap News Agency.

Daishin Securities and Mirae Asset Global Investments also reported security incidents on 28 October, prompting scrutiny from financial authorities.

Bithumb said the compromised system operated separately from its cryptocurrency trading platform, limiting direct access through that breach.

Daishin Securities confirmed that hackers accessed personal information belonging to 38,490 customers, including names, email addresses and mobile phone numbers.

Bithumb was investigating whether customer information had been exposed, while the confirmed scope of the incident remained unclear.

The exchange notified South Korea’s Korea Internet & Security Agency and Personal Information Protection Commission after discovering the breach.

The incidents followed cyberattacks affecting 16 South Korean financial firms by 14 October, according to the country’s financial supervisory chief.

The investigation will determine whether Bithumb’s breach exposed customer data beyond the information already identified.