> JapanHacked_Cybersecurity incidents in Japan

Government

Kiyose City

Kiyose City (Kiyose, Tokyo; Municipality) appears in 1 related cybersecurity incident. The latest was disclosed on 2026-11-08.

Profile

Industry/type: Municipality
Location: Tokyo, Kiyose
Website: https://www.city.kiyose.lg.jp/

Public figures

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Metric	Value	Scope	As of	Source
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Incident history

Disclosed 2026-11-08Updated 2026-11-10 12:08Aichi, Fukushima, Hokkaido, Ibaraki, Ishikawa, Kanagawa, Kyoto, Osaka, Tokyo, Yamanashi[Contained][Severity: Critical][Through a supplier][Major]
teket: member data leak confirmed; all electronic-ticket services suspended
[Intrusion][Data leak][Service outage]Organizations 31

		Incident	Role	Impact level				Methods	Impacts		Status
2026-11-08	2026-11-10 12:08	teket: member data leak confirmed; all electronic-ticket services suspended	[Through a supplier]	[Major]	[Critical]	31 teket Inc., Fukushima Prefecture, Kanagawa Prefecture, Hino City, Ichinomiya City, Okazaki City, Administrative Agency for Osaka City Museums, Chuo University, Dragon Inc., Fujizakura Sports Club, Hachioji City, Hockey Japan League, Ishikawa Prefectural Music and Culture Promotion Corporation, Japan Amateur Radio League, Japan Philharmonic Orchestra, Kiyose City, Kunitachi College of Music, Kyoto City Arts and Culture Association, Kyowa Sangyo Co., Ltd., Musashino Ongaku Gakuen, Pacific Philharmonia Tokyo, Sapporo Lifelong Learning Promotion Foundation, Tokyo Reiki Kogyo Co., Ltd., Tokyo Sports and Culture Foundation, Tokyu Bunkamura Co., Ltd., Tokyu Community Corp., Tsukuba Science Expo Memorial Foundation, Yokohama DeNA BayStars Baseball Club, Inc., LF Concert, Nagoya Philharmonic Orchestra, Tokyo Sunbeams	Aichi, Fukushima, Hokkaido, Ibaraki, Ishikawa, Kanagawa, Kyoto, Osaka, Tokyo, Yamanashi	[Intrusion]	[Data leak][Service outage]	Unknown	[Contained]