> JapanHacked_Cybersecurity incidents in Japan

Company

Chubu Telecommunications Co., Inc.

Chubu Telecommunications Co., Inc. (Naka, Nagoya, Aichi; Information and communications) appears in 1 related cybersecurity incident. The latest was disclosed on 2026-06-23.

Profile

Industry/type: Information and communications
Location: Aichi, Nagoya, Naka
Website: https://www.ctc.co.jp/

Public figures

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Metric	Value		As of	Source
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Incident history

Disclosed 2026-06-23Updated 2026-10-22Aichi, Kagawa, Tokyo[Contained][Severity: Critical][Through a supplier][Critical]
KDDI: unauthorized access to its mail system for ISPs
[Intrusion][Data leak]Leaked 12.2MOrganizations 7

		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]