All Breaches
BookOff Data Breach
Unauthorized access was detected in the digital infrastructure of BookOff Group Holdings, Japan's largest used bookstore and multimedia resale chain.
6.4 Million
Reported Records
8
Data Types
Critical
Severity
Oct 20, 2026
Last updated
Exposed Data Types
8- Email addresses
- Hashed passwords
- Names
- Dates of birth
- Phone numbers
- Physical addresses
- Customer IDs
- Purchase histories
About This Breach
The incident compromised the personal details of approximately 6.43 million registered accounts across BookOff Online and retail loyalty programs. Exposed records include names, email addresses, salted password hashes, dates of birth, telephone numbers, postal addresses, member identifiers, and order transaction history.
Verification and editorial method
LeakData compares the incident name, date, affected-record count, and exposed data types with accessible sources. Unverified fields are not presented as facts, and records are updated when new evidence becomes available.
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