バルテスHD announced that a total of 47,502 member email addresses had been leaked following unauthorized access to アララメッセージ, which handles email distribution for Qbook members. The leaked data comprised email addresses and some attribute information, and did not include names, passwords or other such information, according to the company.
バルテス・ホールディングス disclosed an initial report on 10 November 2026. The incident involved the email newsletter distribution platform for Qbook members, where アララメッセージ, provided by the outsourced contractor アララ, was reportedly subject to unauthorized access by a third party.
The confirmed leak involved 47,502 email addresses, excluding duplicates. The company said that other information, including names, login passwords, company names, addresses and telephone numbers, had not been leaked.
Some of the data overlapped with information from the large-scale leak on アララ's side, and the Qbook leak is being treated as part of the upstream incident. アララ has disclosed that more than approximately 81.32 million email addresses, excluding duplicates, may have been leaked or removed in total.
The company plans to request information from アララ while reviewing its external service management framework, determining the cause, and implementing measures to prevent recurrence.