Confirmed

Mybo Fellows: membership-system intrusion leaked data on 419 members

Parent DCM Holdings disclosed Oct 13, 2026. Anomalous access Sep 21 confirmed as intrusion Oct 8; app fully stopped Oct 9. 419 members: member number, email, status, stage, points etc. Name/address/phone/DOB/password/cards not included. Headcount still being refined.

Last updated: 2026-11-09

Overview

419 people (current figure under refinement).

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. 会員サービス「マイボ」における不正アクセスによる会員情報の漏えいに関するお詫びとお知らせDCMホールディングス株式会社 · 2026-11-09

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