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Bithumb, one of Korea's largest cryptocurrency exchanges, has confirmed that personal information was leaked after an unauthorized outsider accessed its internal mobile groupware system, with the breach believed to have occurred the previous day. The exchange said it reported the incident to the Korea Internet & Security Agency (KISA) and the Personal Information Protection Commission on the day it became aware, and is still analyzing the exact scope of the leak, including whether member information was affected. The hack is part of a broader wave of cyberattacks hitting Korea's financial sector, with Daishin Securities also reporting that personal data of 38,490 customers, including names, email addresses and mobile phone numbers, was leaked, and asset manager Mirae Asset Global Investments also reporting a breach. In response, the government plans large-scale vulnerability inspections on around 170 key private-sector IT infrastructures. Korean media coverage focuses on the breach details and the authorities' response, while the exchange's statement stresses that the extent of the leak is still under analysis.