Telecom and ISPs

J:COM Mesh Wi-Fi app

J:COM Mesh Wi-Fi app (run by JCOM Co., Ltd.) was hit in 1 recorded cybersecurity incident. The latest was disclosed on 2023-11-22.

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https://www.jcom.co.jp/service/net/option/mesh-wi-fi/

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		Incident	Role	Impact level				Methods	Impacts		Status
2023-11-22	2023-11-29 08:05	J:COM: the access log server of a mobile app of its mesh Wi-Fi provider's partner was breached and personal data of about 230,000 customers leaked	[Through a supplier]	[Critical]	[Critical]	1 JCOM Co., Ltd.	Tokyo	[Intrusion]	[Data leak]	231,941	[Investigating]

Other incidents of the operator (1)

		Incident				Methods	Impacts		Status
2026-06-23	2026-07-06	KDDI: unauthorized access to its mail system for ISPs	[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]