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

Response: 7 events

Back to latest
  1. Reported its findings and prevention measures to the Financial Services Agency
  2. Second report: first leak date moved to June 10, 2026 and count updated to about 4.4 million customers
  3. Started sending letters to affected customers; finished on July 30, 2026
  4. No misuse of the leaked data confirmed as of the announcement
  5. By the announcement, reported to the Financial Services Agency, the police and other bodies
  6. Announced the breach: about 4.38 million customers
  7. Stopped the related systems to stop the leak spreading
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