Overview
Second report: "about 1,000" (count blank) from mail sent October 8-29. No names, addresses, account numbers or PINs confirmed leaked. Per the company, this stems from unauthorised access to the Arara email-delivery platform (recorded separately); this figure is a subset of the vendor scope 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
- 当行が利用するメール配信サービスへの不正アクセスによるお客さまメールアドレス流出について（第2報）株式会社栃木銀行 · 2026-11-09
- 当行が利用するメール配信サービスへの不正アクセスによるお客さまメールアドレス流出について株式会社栃木銀行 · 2026-11-09