Amid a series of personal data breaches caused by unauthorized access, a large-scale leak involving approximately 1.09 million MUJI credit card member records has been reported, while approximately 15.82 million sets of member information and other data from アソビュー have also been reported as leaked. The government is considering emergency measures and establishing a support organization, while the companies continue to determine the scope of the impact and implement countermeasures.
At the lottery site, users' passwords were changed unintentionally, and use of the site has been temporarily suspended. Mizuho Financial Group is currently confirming the scope of the impact and plans to contact affected users.
It has emerged that approximately 1.09 million credit card member records, including card numbers and other data, may have been leaked from “MUJI.” Approximately 340,000 records are currently valid, and names, dates of birth and addresses may also have been exposed. Separately, an announcement said that up to approximately 27.26 million email addresses and other details of app members had been leaked.
The leisure-booking service アソビュー announced that approximately 15.82 million sets of member information and booking information had been leaked. Email transmissions through アララ were affected, extending the impact to other companies. A potential leak of information on users of Denny's former app was also announced, and the information may include names and addresses.
The government is considering establishing a new support organization and taking emergency measures to counter cyberattacks. Its plans include strengthening defenses through the use of AI and thoroughly implementing countermeasures, as well as strengthening cooperation with the police and local governments. Companies' efforts to call on the government to introduce active cyber defense have also been reported.