All Breaches
Benesse Corporation Data Breach
In June 2014, Japanese correspondence education and publishing company Benesse Corporation (benesse.co.jp) suffered a massive insider data theft after a subcontracted database engineer copied customer records onto a personal smartphone and sold them to data brokers.
35 Million
Affected People
5
Data Types
Critical
Severity
Oct 27, 2026
Last updated
Exposed Data Types
5- Names
- Physical addresses
- Phone numbers
- Dates of birth
- Genders
About This Breach
Publicly disclosed on July 9, 2014, and confirmed in final forensic tallies to affect 35,040,000 children and parents, the leak exposed full names, postal addresses, phone numbers, dates of birth, and genders.
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.
Report missing or incorrect information
