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On October 9, 2026, BOOKOFF GROUP HOLDINGS LIMITED announced that a third party had gained unauthorized access to a system, provided by one of its subsidiaries, that manages member information, and that it had confirmed member data had been leaked outside the company. It confirmed the unauthorized access on October 6, and its investigation found member data had been taken from outside. Up to about 6.43 million records may be affected; this is the number of member numbers, not the actual number of people. The data items are name, date of birth, gender, email address, phone number, postal code and address, password hash, point card number and member number. Payment data such as credit card details is not held in that system and is not included. As of the announcement, the company had not confirmed that the data had been published or misused by a third party. It warns members about suspicious contact and says it will notify affected people individually. The subsidiary's name, the services involved, the cause and the confirmed number of people had not been disclosed as of October 10. This site's take: anyone who has registered as a Bookoff member should change the password on any other service that shares it, and should not open links in emails or text messages claiming to be from Bookoff.