Yellow Hat: member data taken through the 2Rinkan app API
At 2Rinkan Yellow Hat, a Yellow Hat subsidiary, attackers took information from inside the 2Rinkan mobile app and, from early on 20 April, called an API that returned personal data without the app, pulling customer data from the web server. The third report on 19 June confirmed 3,179,454 point, mobile and app members leaked: names, addresses, phone numbers, birth dates, genders, emails, member numbers, app IDs and passwords, point balances and vehicle details. The app was restricted, with a restart planned for October. The final confirmed count was reduced from the earlier maximum of 3,455,754.
Disclosed
2026-04-23
Organizations involved
1
Leaked or at risk
3.5M
3,455,754
Downtime
Unknown
Timeline
- Started, Detected 2026-04-20
- Disclosed 2026-04-23
- 3 days
Attack or cause
- Method
- [API abuse]
- Impact
- [Data leak][Service outage]
- Entry point
- API
Data exposed or at risk
Services hit
Organizations involved
[Breached][Critical]Tokyo, OtaWholesale and retail trade3,179,454 leaked
Yellow Hat Ltd.Its subsidiary 2Rinkan Yellow Hat
Sources
- [1][Official]連結子会社における不正アクセスによる個人情報漏えいに関するお詫びとお知らせ【第三報・最終報】Yellow Hat · 2026-06-19