已確認

Mitsui Sumitomo Insurance: about 37,000 customer records leaked from policyholder portal intrusion

After detecting unauthorised access on the night of November 2, the insurer announced a partial service suspension on November 4 and on November 6 confirmed a leak of policyholder-portal users' data.

最後更新: 2026-11-09

此內容以 English 顯示。

概述

"About 37,000" (as of 9:00 November 6; count blank): policy numbers, names, addresses, phones and emails; no card or bank data. Group company Aioi Nissay Dowa made a similar announcement (separate record).

時間軸

  1. 發生
  2. 發現
  3. 公布

組織應對措施

Per the notice, the organisation investigated and contained the incident, notified individuals and offered monitoring or protective resources.

使用者應對建議

Be wary of emails, SMS or calls impersonating the organisation; do not open links or attachments or enter passwords or card details. Change reused passwords on other services.

資訊來源

  1. 当社システムへの不正アクセスに伴う情報漏えいについて三井住友海上火災保険株式会社 · 2026-11-09

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