Company

KDDI Corporation

KDDI Corporation (Shinjuku, Tokyo; Information and communications) appears in 1 related cybersecurity incident. The latest was disclosed on 2026-06-23.

Profile

Industry/type

Information and communications

Location

Tokyo, Shinjuku

Website

https://www.kddi.com/

Group companies

Public figures

Employees9,891Non-consolidated2026-03-31
METI: Gビズインフォ
Revenue¥3.9TNon-consolidated2026-03-31
METI: Gビズインフォ
Capital¥141.9BNon-consolidated2026-03-31
METI: Gビズインフォ

Metric	Value		As of	Source
Employees	9,891	Non-consolidated	2026-03-31	METI: Gビズインフォ
Revenue	¥3.9T	Non-consolidated	2026-03-31	METI: Gビズインフォ
Capital	¥141.9B	Non-consolidated	2026-03-31	METI: Gビズインフォ

Incident history

Disclosed 2026-06-23Updated 2026-10-22Aichi, Kagawa, Tokyo[Contained][Severity: Critical][Breached][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	[Breached]	[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]