Monogatari Corporation, which operates Yakiniku King, announced on October 5th that its official app's member management system suffered unauthorized access by a third party, resulting in the leak of 10,788,963 pieces of member information. With 10,808,784 registered app users, almost all users are affected.
The leaked information includes member IDs, names (as registered in the app), email addresses, and phone numbers. However, login passwords, birthdates, genders, postal codes, and store usage history (including points held) were not leaked. The company also stated that it does not store credit card or other payment information.
The unauthorized access was confirmed on October 2nd. The company implemented communication blocking and defensive measures, but confirmed the leak of member information on the following day, October 3rd. Investigations into the cause and the circumstances that allowed the unauthorized access are currently ongoing.
As of now, there has been no confirmation that the leaked information has been publicly disclosed to an unspecified number of people or illicitly used. The official app continues to operate with enhanced security measures, and no information leaks have been confirmed for official apps of other brands operated by the company.
