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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.

最后更新: 2026-11-09

此内容以 English 显示。

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).

时间线

  1. 发生
  2. 发现
  3. 披露

组织应对措施

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

用户应对建议

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.

信息来源

  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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