Kaikatsu Frontier: unauthorized access to Kaikatsu CLUB and FiT24 member data

Kaikatsu Frontier detected unauthorized server access on 18 January 2025 and began public notices and app restrictions on 20 January. Up to 7,290,087 Kaikatsu CLUB and certain FiT24 member records may have been exposed, including names, genders, addresses, telephone numbers and birth dates. The 17 March investigation report said actual leakage and secondary harm had not been confirmed and that app functions resumed in stages from 19 to 28 February. Payment-card details, email addresses and app passwords were excluded. On December 4, 2025 the company reported that police had announced an arrest concerning the incident.