Overview
"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).
Timeline
- Occurred
- Discovered
- Disclosed
Organization response
Per the notice, the organisation investigated and contained the incident, notified individuals and offered monitoring or protective resources.
What you can do
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.
Sources
- 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