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Aflac Life Insurance Japan policyholder data breach

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Made public · about 4.4 million customers

What leaked7

Hard to replace

  • Bank account number
  • Mobile number
  • Home or delivery address
  • Other profile data

Permanent

  • Date of birth
  • Full name
  • Gender
  • Bank account numberpremium payment account (bank, branch, type, number, holder) of about 220,000 customers
  • Mobile numberphone number · type not stated
  • Full namepolicyholders, insured persons and beneficiaries
  • Other profile datapolicy number, coverage, and name, birth date, gender, address and phone of the second contact · a relative or other person

To-dos3 · about 30 min in all

  1. Know the scam pattern: calls and texts that cite these leaked detailsabout 5 minfreeLimits harm from: scam calls, phishing messages
  2. Turn on instant transaction alertsabout 5 minHelps you notice: scam calls
  3. Remove your address and phone from public profiles and tighten SNS privacyabout 20 minfreeLimits harm from: visits or contact at home

What happened next10 events

  1. Undetected 2 events15 days · Back to latest
  2. Response 7 eventsNotice in 15 days · show events
  3. RemedyNone on record
  4. Penalty 1 eventUnder investigation · show events
  5. DisputesNone on record

Undetected: 2 events

Back to latest
  1. Detected high CPU load at 06:30 JST and found unauthorised access
  2. Intrusion began
Company
Aflac Life Insurance Japan
When it happened
–
Company detected it
Made public
Notice
Leak confirmed
Affected
about 4.4 million customers · approx.; Aflac's figure as reported by the press, about 220,000 of them with premium payment account data; also about 40,000 agencies

How the facts developed

  1. Second report: first leak date corrected from June 15, 2026 to June 10, 2026, count updated from about 4.38 million to about 4.4 million customers (press)

Sources