Investigating

MSC: website intrusion may have exposed 297 form users’ personal data

After unauthorized access to the corporate website, form-submission data may have been viewable; disclosed Aug 25, 2026. 297 people in scope.

Last updated: 2026-11-09

Overview

297 people (name, company, email, phone; e.g. Dec 2023–Jul 2026).

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. 弊社ホームページへの不正アクセスに関するお詫びとご報告株式会社マネジメントサービスセンター · 2026-11-09

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