Company

JCOM Co., Ltd.

JCOM Co., Ltd. (Minato, Tokyo; Information and communications) appears in 1 related cybersecurity incident. The latest was disclosed on 2026-06-23.

Profile

Metric	Value		As of	Source
Employees	15,672		2026-09-24	METI: Gビズインフォ

		Incident	Role	Impact level				Methods	Impacts		Status
2026-06-23	2026-10-22	KDDI: unauthorized access to its mail system for ISPs	[Through a supplier]	[Critical]	[Critical]	7 JCOM Co., Ltd., KDDI Corporation, BIGLOBE Inc., Chubu Telecommunications Co., Inc., KDDI Web Communications Inc., NIFTY Corporation, STNet, Incorporated	Aichi, Kagawa, Tokyo	[Intrusion]	[Data leak]	12,231,954	[Contained]