ソニー生命保険Data breach / unauthorized access incident
- Occurred on
- February 27, 2026
- Announced on
- February 28, 2026
- Severity
- BIncidents centered on names and contact details.
- Scale
- 385,000 records
- Main impact
- Unauthorized access to subscriber-only sites and similar systems resulted in the leakage of 約38.5万件 of customer information (names, addresses, telephone numbers, birth information, and securities numbers / contract details). My Number, credit card, and bank account information are said not to be included.
- Information involved
- Full nameDate of birthPhone numberHome addressUser / member ID
- Cause / key point
- Unauthorized access by a third party was confirmed, and customer information is believed to have been acquired through external access.
- Industry
- Finance & insurance
- Sources
- Last updated
- October 29, 2026
Where to go for this information
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Written & reviewed
Reviewed byYutaro SasaoFounder & CEO, MediaLeap Inc.
CEO of MediaLeap Inc. Working on both sides of web advertising and web media since 2013; founded the company in May 2025.
Review scope: cross-checking against primary sources (official and government announcements), verifying claims stay within the facts, and checking source attribution。Last reviewed:
Written by:Leak Watch editorial team (AI-assisted drafts verified against sources by the editorial team) · Reviewer profile · Request a correction
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Attack method classification: Unauthorized access (method undisclosed)(Breached, but the technique was not identified or disclosed)
Read the Unauthorized access (method undisclosed) guide and national trends →