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
- Detected 2026-03-27
- Disclosed 2026-03-30
- 3 days
Attack or cause
- Method
- [Intrusion]
- Impact
- [Data leak][Service outage]
- Entry point
- Unknown
Data exposed or at risk
Organizations involved
[Breached][Major]Kyoto, KumiyamaManufacturing
Cota Co., Ltd.
Sources
- [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][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