> JapanHacked_Cybersecurity incidents in Japan

Company

Yamada Finance Service Inc.

Yamada Finance Service Inc. (Takasaki, Gunma; Finance and insurance) appears in 1 related cybersecurity incident. The latest was disclosed on 2026-11-02.

Profile

Industry/type: Finance and insurance
Location: Gunma, Takasaki
Website: https://www.ymd-fs.jp/

Public figures

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Metric	Value	Scope	As of	Source
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Incident history

Disclosed 2026-11-02Updated 2026-11-09Chiba, Gunma, Osaka, Saitama, Tokyo[Investigating][Severity: Critical][Through a supplier][Major]
Prestige Core Solution: up to about 5.5 million records stolen, including three full card numbers
[Intrusion][Data leak][Service outage]Leaked 5.5MOrganizations 22

		Incident	Role	Impact level				Methods	Impacts		Status
2026-11-02	2026-11-09	Prestige Core Solution: up to about 5.5 million records stolen, including three full card numbers	[Through a supplier]	[Major]	[Critical]	22 Nissan Financial Services Co., Ltd., Prestige Core Solution Inc., KDDI Corporation, Mitsui Sumitomo Insurance Company, Limited, Sompo Japan Insurance Inc., 2Rinkan Yellow Hat Co., Ltd., BMW Japan Corp., BMW Japan Finance Corp., cyma Yellow Hat Co., Ltd., ENEOS Corporation, JACCS Co., Ltd., Kohnan Shoji Co., Ltd., National Mutual Insurance Federation of Agricultural Cooperatives, SBI Insurance Co., Ltd., Subaru Corporation, Subaru Finance Co., Ltd., Yamada Finance Service Inc., Zurich Insurance Company, AXA General Insurance Company, Limited, Porsche Financial Services Japan K.K., Porsche Japan K.K., Sony Assurance Inc.	Chiba, Gunma, Osaka, Saitama, Tokyo	[Intrusion]	[Data leak][Service outage]	5,500,000	[Investigating]