> JapanHacked_
[Resolved][Severity: Major][Intrusion]

Cota: cyberattack causes a system outage

PC anomalies revealed intrusion on March 27; disclosure followed March 30 and servers were disconnected. The August 20 report found no confirmed external leakage or misuse but identified eight potentially viewed categories. The largest stated category was 55,408 shareholder records; others included 35,274 direct-delivery customer records and 16,133 business-contact records. No deduplicated total across categories was stated. Its final report confirmed restoration and normal operation of all systems.

Disclosed

2026-03-30

Organizations involved

1

Leaked or at risk

55.4K

55,408

Downtime

Unknown

Timeline

  1. Detected 2026-03-27
  2. Disclosed 2026-03-30
  3. 3 days

Organizations involved

Open in organization search

Sources

  1. [1][Official]お客さまの個人情報に関するお知らせとお詫びCota Co., Ltd. · 2026-08-20
  2. [2][Official]サイバー攻撃によるシステム障害発生のお知らせ(最終報)Cota Co., Ltd. · 2026-08-20