Overview
Email addresses and their passwords leaked: 397,152 customers (456,159 address/password pairs). This stems from the intrusion into KDDI's mail platform for ISPs (recorded separately); the figure is a subset of KDDI's total and must not be added to it.
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
- ピカラのメールサービスに対する不正アクセスの発生について株式会社STNet · 2026-11-09
- ピカラのメールサービスに対する不正アクセスについてのご報告株式会社STNet · 2026-11-09