Investigating

Shonai Town: library and training-room users may have leaked via YCC ransomware

Possible data leak: After the April 2, 2026 YCC attack, build-time data from the town and its designated manager was found on the hit server by April 17.

Last updated: 2026-11-09

Overview

Library 9,257 and training-room 3,739 are subsets and not summed (count blank). Name, address, birth date, phone and email among fields.

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. 株式会社YCC情報システムに対する不正アクセス発生に関する報告について庄内町 · 2026-11-09

Related information

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