A subsidiary of Bookoff Group confirmed in a second report that unauthorized access to the membership management system resulted in the external acquisition of some member information. Approximately 6,380,000 members are affected. Credit card information and similar data are not included. At present there is no impact on financial results; recurrence-prevention measures and an external expert investigation are ongoing. 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Approximately 6,380,000 members are affected. Credit card information and similar data are not included. At present there is no impact on financial results; recurrence-prevention measures and an external expert investigation are ongoing. Revision of earnings guidance is undecided.","jir_summary":"### Overview and Facts\nIn the second report regarding the unauthorized access announced on October 9, 2026, it was confirmed that a third party accessed Bookoff Corporation's membership management system and obtained member information externally. The leaked data pertains to app members, online store members, and web members, and does not include credit card information or the like. Countermeasures against the attack origin have been completed and all systems are operating normally. The cause investigation is being conducted together with external experts, recurrence-prevention measures are being implemented, and detailed information will be withheld from public disclosure.\n\n### Impact and Future Response\nThe impact on results for the cumulative consolidated first quarter period is currently unknown, but at this time it has not been factored into the consolidated earnings forecast for the fiscal year ending May 2027. A report has been submitted to the Personal Information Protection Commission, and investigations are being advanced in cooperation with the police. Additional security measures and recurrence-prevention actions will be implemented, and if revisions to earnings forecasts occur they will be announced promptly.","jir_financial_highlights":"Number of member data records affected: 6,427,735 cases (Unknown)\nNumber of affected individuals: 6,383,279 people (Unknown)\nImpact on financial results: Unknown (Not incorporated into current consolidated earnings forecast)","jir_category":"","jir_hashtags":"#BookoffGroupHoldings, #PersonalInformationProtection, #DisclosureUpdate","jir_key_figures":"Number of member data records leaked: 6,427,735 cases\nNumber of affected individuals: 6,383,279 people\nScope of impact: App members, online store members, and web members are affected","jir_meta_title":"Bookoff Group Holdings Limited \u2014 Notice of Personal Information Leakage Due to Unauthorized Access (Second Report) | October 2026","jir_meta_description":"Summary of the second report on unauthorized access to Bookoff Group's membership management system: number of affected members, scope of leaked data, impact status, and planned responses and recurrence-prevention measures. The impact on financial results is currently unknown; further information will be provided when available.","jir_og_title":"Bookoff Group Holdings Limited \u2014 Notice: Unauthorized Access (Second Report)","jir_og_description":"Second report on Bookoff Group's member information leakage: affected record counts, scope, and future response policies. Financial impact is undetermined.","jir_og_image_url":"\/assets\/og\/company-general_ir.jpg","jir_chart_data_collection":"[]","ir_related_company":57249,"ir_release_date":"","ir_type":"","ir_is_new":false,"ir_document_url":"","jir_ir_type":"disclosure_update","footnotes":""},"sector":[],"importance":[],"class_list":["post-129807","ir_release","type-ir_release","status-publish","hentry"],"yoast_head":"\n