Reports distributed on 4 November said that approximately 1.09 million records, including card numbers, had been exposed at MUJI, while an incident involving the exposure of approximately 15.82 million member records at Asoview was also reported. Information leaks resulting from unauthorized access have also been reported at Denny's and numerous other companies.
Approximately 1.09 million records, including card numbers, may have been exposed at MUJI, and some user information registered on Denny's legacy app may also have been leaked. Denny's said that the unauthorized access occurred through system processing during the migration from the legacy app, and that it does not hold sensitive information such as names and addresses.
Asoview has been reported to have suffered a leak of member information and other data, while information leaks resulting from unauthorized access have also been reported at services including アララ and @cosme. These incidents are said in some cases to have involved personal information such as member names, addresses and email addresses, as well as vehicle information, reservation information and some credit card information.
The government and police agencies are also strengthening measures against cyberattacks, including establishing teams of ethical hackers and support desks for small and medium-sized enterprises. Meanwhile, companies including GMO are setting out policies on compensation and goodwill payments for unauthorized access, while increasing warnings to users and strengthening preventive measures.