> JapanHacked_Cybersecurity incidents in Japan

Payments and points

CLUB AJ Card

CLUB AJ Card (run by JACCS Co., Ltd.) was hit in 1 recorded cybersecurity incident. The latest was disclosed on 2026-11-02.

About the service

Website

https://www.jaccs.co.jp/service/card_lineup/teikei/aj.html

Run by

JACCS Co., Ltd.

Category

Payments and points

For

People

Incident history

Disclosed 2026-11-02Updated 2026-11-06Chiba, 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 18

		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]	[Major]	[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]

Other incidents of the operator (1)

Disclosed 2023-07-28Updated 2023-08-24 08:05Tokyo[Investigating][Severity: Major]
JACCS: ransomware encrypts electronic form service data
[Ransomware]Organizations 1

		Incident				Methods	Impacts		Status
2023-07-28	2023-08-24 08:05	JACCS: ransomware encrypts electronic form service data	[Major]	1 JACCS Co., Ltd.	Tokyo	[Ransomware]		Unknown	[Investigating]