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Investigating

COTA: cyberattack may have allowed viewing of staff, partner, shareholder and customer data

Possible data leak: Unauthorized access found Mar 27, 2026 after PC anomalies; full isolation followed. After a Mar 30 outage notice, expert review found no confirmed exfiltration/misuse but could not rule out viewing; Aug 20 notice listed category counts for notification. No card data.

Last updated: 2026-11-09

Overview

Category counts (591/684/35,274/16,133/55,408/661/124/272) are subsets and are not summed → count blank.

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. お客さまの個人情報に関するお知らせとお詫びコタ株式会社 · 2026-11-09

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