Two Japanese companies have disclosed major data breaches after unauthorized access to their computer systems, potentially exposing information belonging to millions of customers.
Monogatari Corp., operator of the Yakiniku King barbecue restaurant chain, said data tied to more than 10 mn customers was leaked following unauthorized access to its reservation and rewards app. The exposed information included customer names, email addresses, phone numbers and membership numbers.
The company detected the breach on Friday. It said it had found no evidence so far that the stolen information had been misused.
Daiwa Securities Group separately disclosed a breach involving a server operated by an outside contractor. Data belonging to about 110,000 customers of its brokerage business may have been compromised.
The unauthorized access occurred between Friday evening and Saturday morning on infrastructure operated by Scala Communications Inc. The company provides Daiwa Securities with an online customer inquiry management service.
Potentially exposed information includes customer names, email addresses and account numbers. When inquiries containing no personal information are included, about 220,000 data records may have been affected.
Daiwa said the compromised information could not be used to execute transactions, including online trades. The brokerage also said it had found no evidence that the potentially exposed data had been published or circulated online.
The incidents affect different parts of Japan’s consumer and financial sectors, but both involved unauthorized access to systems holding customer information. In each case, the companies said investigations were continuing and no misuse of the affected data had been confirmed.
