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Chiba Bank: subsidiary Chibagin Shoten site intrusion may have exposed bank customers’ data

Intrusion into contractor/subsidiary Chibagin Shoten’s corporate-site server may have exposed bank customers’ name, address, email, phone and application numbers; disclosed Sep 17, 2026. ~722 individuals and ~1,616 corporates. Cards/passwords not stored.

Last updated: 2026-11-09

Overview

Approximate category figures → blank. Victim side of Chibagin Shoten incident.

Timeline

  1. Occurred
  2. Discovered
  3. 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

  1. 子会社ちばぎん商店のコーポレートサイトへの不正アクセス事案の発生について株式会社千葉銀行 · 2026-11-09

Related information

chibagin-shoten-corporate-site-intrusion-possible-leak-2026

Related information

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