Overview
Possible fields: emails and delivery management numbers. No financial-transaction data. Count under review (count blank). This stems from the Ymir Link Cuenote FC intrusion (recorded separately); the 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
- 外部委託先への不正アクセスによるお客さま情報の漏えいの可能性について株式会社りそな銀行・株式会社埼玉りそな銀行・株式会社関西みらい銀行 · 2026-11-09