Overview
Approximately 2,400 email-related people and approximately 71,700 group-contact people are separate, potentially overlapping scopes and are not added. Possible fields include names, organizations, roles, email and phone. No electricity/gas customer-data leak or power-supply impact was confirmed.
Timeline
- Occurred
- Discovered
- Disclosed
Investigation followed an external report.
Possible exposure publicly disclosed.
Organization response
The company disabled misused credentials, blocked access and reviewed information with specialists and authorities.
What you can do
Beware of impersonation using business contact details and verify unusual requests through known contacts.
Sources
- Possibility of information leakage due to unauthorized accessChubu Electric Power Co., Inc. · 2026-11-09