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[Investigating][Severity: Major][Intrusion]

Mitsui Direct General Insurance: unauthorized access leaks about 234,000 customer records

Mitsui Direct disclosed a separate breach, unrelated to its sister insurers, that leaked about 234,000 customer records with names, addresses, vehicles and policy terms.

Disclosed

2026-11-06 16:02

Organizations involved

1

Leaked or at risk

234K

234,000

Downtime

Unknown

Scope in the insurer’s own notice

The insurer detected unauthorized website access early on 4 November and stopped all web/app procedures. Up to 234,000 records leaked, including policyholder/named-insured names, addresses, birth dates, phones, emails, vehicle data, contract terms and coverage. Card numbers, bank-account numbers and other payment details, and My Page login passwords did not leak. Procedures remained stopped at 13:00 on 6 November, with no reopening date. [2]

What happened

According to the Asahi Shimbun, MS&AD group member Mitsui Direct General Insurance Co., Ltd. announced on 6 November that a separate unauthorized access, distinct from the one on the policyholder pages of Mitsui Sumitomo Insurance and others, leaked about 234,000 customer records. They include names, addresses, vehicle details and policy terms. No misuse has been confirmed. [1]

Timeline

  1. Detected 2026-11-04
  2. Disclosed 2026-11-06
  3. 2 days

Organizations involved

Sources

  1. [1][News]MS&AD傘下4社、顧客情報計72万件漏洩 カード・口座の一部もThe Asahi Shimbun · 2026-11-06 16:02
  2. [2][Official]当社システムへの不正アクセスに伴うお客さま情報の漏えいについてMitsui Direct General Insurance · 2026-11-06