Investigating

Isesaki City: Ryomo tablet-support intrusion may have exposed 3,789 student account records

Ryomo ransomware incident on Aug 14, 2026; on Sep 24 the city learned student school/grade/name/account/password data (3,789) may have leaked; disclosed Sep 28. Address/grades/health out of scope.

Last updated: 2026-11-09

Overview

3,789 records.

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. 本市委託先への不正アクセスによる情報漏洩の可能性について伊勢崎市 · 2026-11-09

Related information

ryomo-systems-ransomware-intrusion-possible-leak-2026

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