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Organizations involved in this incident2026-06-23KDDI: unauthorized access to its mail system for ISPsOpen the incident

7 results

CompanyInformation and communicationsTokyo, Minato[Through a supplier][Critical]
JCOM Co., Ltd.
Incidents 1Latest 2026-06-23Employees 15,672
CompanyInformation and communicationsTokyo, Shinjuku[Breached][Critical]
KDDI Corporation
Incidents 1Latest 2026-06-23Employees 9,891
CompanyInformation and communicationsTokyo, Chiyoda[Through a supplier][Critical]
BIGLOBE Inc.
Incidents 1Latest 2026-06-23Employees 636
CompanyInformation and communicationsAichi, Nagoya, Naka[Through a supplier][Critical]
Chubu Telecommunications Co., Inc.
Incidents 1Latest 2026-06-23
CompanyInformation and communicationsTokyo, Minato[Through a supplier][Critical]
KDDI Web Communications Inc.
Incidents 2Latest 2026-10-21
CompanyInformation and communicationsTokyo, Minato[Through a supplier][Critical]
NIFTY Corporation
Incidents 3Latest 2026-10-21Employees 456
CompanyInformation and communicationsKagawa, Takamatsu[Through a supplier][Critical]
STNet, Incorporated
Incidents 1Latest 2026-06-23

	Role
JCOM Co., Ltd.	[Through a supplier]	[Critical]	Company	Information and communications	Tokyo, Minato	15,672	–	1	2026-06-23
KDDI Corporation	[Breached]	[Critical]	Company	Information and communications	Tokyo, Shinjuku	9,891	–	1	2026-06-23
BIGLOBE Inc.	[Through a supplier]	[Critical]	Company	Information and communications	Tokyo, Chiyoda	636	–	1	2026-06-23
Chubu Telecommunications Co., Inc.	[Through a supplier]	[Critical]	Company	Information and communications	Aichi, Nagoya, Naka	–	–	1	2026-06-23
KDDI Web Communications Inc.	[Through a supplier]	[Critical]	Company	Information and communications	Tokyo, Minato	–	–	2	2026-10-21
NIFTY Corporation	[Through a supplier]	[Critical]	Company	Information and communications	Tokyo, Minato	456	–	3	2026-10-21
STNet, Incorporated	[Through a supplier]	[Critical]	Company	Information and communications	Kagawa, Takamatsu	–	–	1	2026-06-23