A data breach occurred in Yakiniku King's member management system. There were 10,808,784 registered records, of which 10,788,963 were exposed. The exposed information consisted of member numbers, names, email addresses and telephone numbers, and did not include data for members who had withdrawn.
The Yakiniku King data breach that occurred on 3 October involved a large-scale data leak through the member management system. The number of exposed records was almost the entire total. Login passwords, dates of birth and store usage histories were reportedly not exposed.
The exposed information consisted of 4 types of data: member numbers, app registration names, email addresses and telephone numbers. There were 10,808,784 registered records in total, of which 10,788,963 were exposed. Data for members who had withdrawn was not included. The approximately 19,821 records that were not exposed were reportedly accounts for which an email address was not required at the time of initial registration.
Details of the incident and the specific method of unauthorised access were not disclosed. The operator said it had taken measures to prevent a recurrence. The Monogatari Corporation said it had rechecked security across all related brands, and there has been movement toward referring to examples of external testing.