> JapanHacked_Cybersecurity incidents in Japan

Government

Shimotsuke city

Shimotsuke city (Shimotsuke, Tochigi; Municipality) appears in 1 related cybersecurity incident. The latest was disclosed on 2026-10-29.

Profile

Industry/type

Municipality

Location

Tochigi, Shimotsuke

Services

Shimotsuke Online Service

Website

https://www.city.shimotsuke.lg.jp/

Public figures

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Metric	Value	Scope	As of	Source
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Incident history

Disclosed 2026-10-29Updated 2026-11-03 18:13Aichi, Fukui, Fukuoka, Hyogo, Kagoshima, Kanagawa, Okayama, Okinawa, Osaka, Saitama, Shizuoka, Tochigi, Tokyo, Toyama[Investigating][Severity: Critical][Through a supplier][Major]
Arara: Arara Message breach exposes about 77 million email addresses; count under review
[Web app exploit][Data leak][Service outage]Leaked 77MOrganizations 380

		Incident	Role	Impact level				Methods	Impacts		Status
2026-10-29	2026-11-03 18:13	Arara: Arara Message breach exposes about 77 million email addresses; count under review	[Through a supplier]	[Major]	[Critical]	380 Arara Inc., Belc Co., Ltd., Hokuriku Electric Power Company, Kintetsu Miyako Hotels Inc., TKC Corporation, U Co-op, City of Yokohama, Okayama Prefecture, Okinawa Prefectural Government, Osaka City, Suzuki Motor Corporation, Himeji City, The Kagoshima Bank, Ltd., Kinko's Japan Co., Ltd., Toyohashi City, Albait Times Co., Ltd., Bic Camera Inc., e-CHANNEL Co., Ltd., Fukui Shimbun Co., Ltd., Kagoshima Shinkin Bank, Kagoshima Sogo Shinkin Bank, Kintetsu Real Estate Co., Ltd., Kobe Shimbun Inc., Kojima Co., Ltd., Lee Mills & Company Co., Ltd., LightUp Shopping Club Inc., The Minami-Nippon Bank, Ltd., Odakyu Travel Inc., Osaka Gas Co., Ltd., Ryobi Holdings Co., Ltd., Shimotsuke city, Shochiku Multiplex Theatres Inc., Sofmap Co., Ltd., Takanezawa town, Ticketplus, Inc., WATAMI FAST CASUAL MANAGEMENT Co., Ltd., The Yokohama Rubber Co., Ltd., AUTHENTIC JAPAN Co., Ltd., Japan Society of Civil Engineers, Shiki City, Will Co., Ltd., Zaif Inc.	Aichi, Fukui, Fukuoka, Hyogo, Kagoshima, Kanagawa, Okayama, Okinawa, Osaka, Saitama, Shizuoka, Tochigi, Tokyo, Toyama	[Web app exploit]	[Data leak][Service outage]	77,000,000	[Investigating]