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Organizations in Japan involved in cyberattacks and data leaks. Filter by location, industry or type, size and incident involved.

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Organizations involved in this incident2026-10-26palan: intrusion through a data-analysis tool leaks data on up to 33,348 users, campaign participants and inquirersOpen the incident

12 results

GovernmentMunicipalityTokyo, Fuchu[Through a supplier][Critical]
Fuchu City (Tokyo)
Incidents 2Latest 2026-10-26
CompanyInformation and communicationsTokyo, Shinjuku[Breached][Critical]
palan Inc.
Incidents 1Latest 2026-10-26
GovernmentPrefectureGifu[Through a supplier][Major]
Gifu Prefecture
Incidents 4Latest 2026-10-26
GovernmentPrefectureIbaraki, Mito[Through a supplier][Major]
Ibaraki Prefectural Government
Incidents 3Latest 2026-10-26
CompanyPersonal services and entertainmentTokyo, Minato[Through a supplier][Major]
JTB Corp.
Incidents 2Latest 2026-10-26Employees 13,123
GovernmentPrefectureKumamoto, Kumamoto, Chuo[Through a supplier][Major]
Kumamoto Prefecture
Incidents 2Latest 2026-10-26
GovernmentPrefectureMiyazaki, Miyazaki[Through a supplier][Major]
Miyazaki Prefecture
Incidents 2Latest 2026-10-26
CompanyManufacturingTokyo, Taito[Through a supplier][Major]
TOPPAN Inc.
Incidents 2Latest 2026-10-26Employees 10,331
GovernmentMunicipalityKumamoto, Kumamoto, Chuo[Through a supplier][Major]
Kumamoto City
Incidents 2Latest 2026-10-26
CompanyInformation and communicationsGifu, Gifu[Through a supplier][Major]
Gifu Shimbun Inc.
Incidents 2Latest 2026-10-26
CompanyScientific research, professional and technical servicesTokyo, Shibuya[Through a supplier][Major]
JR East Marketing & Communications, Inc.
Incidents 1Latest 2026-10-26
CompanyInformation and communicationsTokyo, Koto[Through a supplier][Major]
JTB Publishing, Inc.
Incidents 1Latest 2026-10-26

	Role
Fuchu City (Tokyo)	[Through a supplier]	[Critical]	Government	Municipality	Tokyo, Fuchu	–	2	2026-10-26
palan Inc.	[Breached]	[Critical]	Company	Information and communications	Tokyo, Shinjuku	–	1	2026-10-26
Gifu Prefecture	[Through a supplier]	[Major]	Government	Prefecture	Gifu	–	4	2026-10-26
Ibaraki Prefectural Government	[Through a supplier]	[Major]	Government	Prefecture	Ibaraki, Mito	–	3	2026-10-26
JTB Corp.	[Through a supplier]	[Major]	Company	Personal services and entertainment	Tokyo, Minato	13,123	2	2026-10-26
Kumamoto Prefecture	[Through a supplier]	[Major]	Government	Prefecture	Kumamoto, Kumamoto, Chuo	–	2	2026-10-26
Miyazaki Prefecture	[Through a supplier]	[Major]	Government	Prefecture	Miyazaki, Miyazaki	–	2	2026-10-26
TOPPAN Inc.	[Through a supplier]	[Major]	Company	Manufacturing	Tokyo, Taito	10,331	2	2026-10-26
Kumamoto City	[Through a supplier]	[Major]	Government	Municipality	Kumamoto, Kumamoto, Chuo	–	2	2026-10-26
Gifu Shimbun Inc.	[Through a supplier]	[Major]	Company	Information and communications	Gifu, Gifu	–	2	2026-10-26
JR East Marketing & Communications, Inc.	[Through a supplier]	[Major]	Company	Scientific research, professional and technical services	Tokyo, Shibuya	–	1	2026-10-26
JTB Publishing, Inc.	[Through a supplier]	[Major]	Company	Information and communications	Tokyo, Koto	–	1	2026-10-26