> JapanHacked_Cybersecurity incidents in Japan

Company

H.I.S. Hotel Holdings Co., Ltd.

H.I.S. Hotel Holdings Co., Ltd. (Shinjuku, Tokyo; Accommodation, food and drink) appears in 1 related cybersecurity incident. The latest was disclosed on 2026-10-21.

Profile

Industry/type: Accommodation, food and drink
Location: Tokyo, Shinjuku
Website: https://www.hishotelgroup.com/
Parent: H.I.S. Co., Ltd.since 2016-11

Public figures

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Metric	Value		As of	Source
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Incident history

Disclosed 2026-10-21Updated 2026-10-27 19:58Aichi, Fukuoka, Hiroshima, Iwate, Kagawa, Miyagi, Nagano, Niigata, Osaka, Tochigi, Tokyo, Toyama[Investigating][Severity: Critical][Through a supplier][Critical]
RAKUS Light Cloud: unauthorized access to the blastmail email delivery service
[Intrusion][Data leak][Service outage]Organizations 345

		Incident	Role	Impact level				Methods	Impacts		Status
2026-10-21	2026-10-27 19:58	RAKUS Light Cloud: unauthorized access to the blastmail email delivery service	[Through a supplier]	[Critical]	[Critical]	345 Ichinoseki City, H.I.S. Hotel Holdings Co., Ltd., HR Vision Co., Ltd., Kakaopiccoma Corp., Meitetsu World Travel, Inc., NHK Publishing, Inc., Niigata Nippo Co., Ltd., RAKUS Light Cloud Co., Ltd., Tohoku EPCO Frontier Co., Inc., Ministry of the Environment, Hiroshima City, Nagano Prefectural Government, Tokyo Metro Co., Ltd., Japan Petroleum Exploration Co., Ltd., Okazaki City, Toyama Prefectural Government, Utsunomiya City, Cells Inc., Creema Ltd., Daihatsu Motor Co., Ltd., Gyet Co., Ltd., Japan Council of Shopping Centers, Kanehara & Co., Ltd., Kyodo News, Nulab, Inc., Sasakawa Sports Foundation, Shikoku Railway Company, Takara Leben Co., Ltd., Tokamachi City, Tokyo Development Foundation for Agriculture, Forestry, and Fisheries, The Bank of Nagoya, Ltd., Sompo Japan DC Securities Inc.	Aichi, Fukuoka, Hiroshima, Iwate, Kagawa, Miyagi, Nagano, Niigata, Osaka, Tochigi, Tokyo, Toyama	[Intrusion]	[Data leak][Service outage]	Unknown	[Investigating]