Company

2Rinkan Yellow Hat Co., Ltd.

2Rinkan Yellow Hat Co., Ltd. (Wako, Saitama; Wholesale and retail trade) appears in 2 related cybersecurity incidents. The latest was disclosed on 2026-11-02.

Profile

Industry/type

Wholesale and retail trade

Location

Saitama, Wako

Services

Website

https://2rinkan.jp/

Parent

Yellow Hat Ltd.

Public figures

–

Metric	Value	Scope	As of	Source
–

Incident history

Disclosed 2026-11-02Updated 2026-11-06Chiba, Saitama, Tokyo[Investigating][Severity: Critical][Through a supplier][Moderate]
Prestige Core Solution: up to about 5.5 million records stolen, including three full card numbers
[Intrusion][Data leak][Service outage]Leaked 5.5MOrganizations 18
Disclosed 2026-04-23Updated 2026-06-19Saitama[Contained][Severity: Critical][Breached][Critical]
Yellow Hat: 2Rinkan app API data theft
[API abuse][Data leak][Service outage]Leaked 3.5MOrganizations 1

		Incident	Role	Impact level				Methods	Impacts		Status
2026-11-02	2026-11-06	Prestige Core Solution: up to about 5.5 million records stolen, including three full card numbers	[Through a supplier]	[Moderate]	[Critical]	18 Nissan Financial Services Co., Ltd., Prestige Core Solution Inc., KDDI Corporation, Sompo Japan Insurance Inc., BMW Japan Corp., BMW Japan Finance Corp., ENEOS Corporation, JACCS Co., Ltd., National Mutual Insurance Federation of Agricultural Cooperatives, SBI Insurance Co., Ltd., Subaru Corporation, 2Rinkan Yellow Hat Co., Ltd., AXA General Insurance Company, Limited, cyma Yellow Hat Co., Ltd., Porsche Financial Services Japan K.K., Porsche Japan K.K., Sony Assurance Inc., Zurich Insurance Company	Chiba, Saitama, Tokyo	[Intrusion]	[Data leak][Service outage]	5,500,000	[Investigating]
2026-04-23	2026-06-19	Yellow Hat: 2Rinkan app API data theft	[Breached]	[Critical]	[Critical]	1 2Rinkan Yellow Hat Co., Ltd.	Saitama	[API abuse]	[Data leak][Service outage]	3,455,754	[Contained]