Bithumb says it detected unauthorized access and personal-data exposure in its internal mobile groupware on October 27 and reported the incident to authorities. Initial findings mainly concern employee information, but the company is also investigating whether member information was included. The number of affected people, data fields and precise attack route remain unconfirmed. The established workplace-system breach should be distinguished from its final customer impact; uncertainty is neither proof of no harm nor proof that trading assets were stolen.