Investigating

Medica Publishing: customer and related personal data may have leaked after ransomware

Possible data leak: Ransomware struck on March 13, 2026 (disclosed March 17). The May 13 investigation found no definitive exfiltration proof but could not rule it out, treating an approximate 641,000 people as at risk.

Last updated: 2026-11-09

Overview

Approximate / possibly duplicated headcount so count blank. Customers, facility staff, educators, societies, authors, staffing registrants, partners and employees.

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. 不正アクセス(ランサムウェア)被害に関するご報告と現在の状況について(第3報)株式会社メディカ出版 · 2026-11-09
  2. 不正アクセス(ランサムウェア)被害による システム障害および情報漏えいに関するお詫びとご報告株式会社メディカ出版 · 2026-11-09
  3. 不正アクセス(ランサムウェア)事案に関する調査結果および再発防止策のご報告株式会社メディカ出版 · 2026-11-09

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