Company

Tohoku EPCO Frontier Co., Inc.

Tohoku EPCO Frontier Co., Inc. (Aoba, Sendai, Miyagi; Electricity, gas, heat and water) appears in 2 related cybersecurity incidents. The latest was disclosed on 2026-10-21.

Profile

Industry/type: Electricity, gas, heat and water
Location: Miyagi, Sendai, Aoba
Website: https://www.tohoku-frontier.co.jp/

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
Disclosed 2026-10-16Updated 2026-10-27 19:58Aichi, Chiba, Fukushima, Hiroshima, Kochi, Miyagi, Nagano, Niigata, Tokyo, Toyama[Investigating][Severity: Critical][Through a supplier][Major]
Studio: unauthorized access to the cloud environment of the Studio website builder
[Web app exploit][Data leak]Organizations 28

		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]
2026-10-16	2026-10-27 19:58	Studio: unauthorized access to the cloud environment of the Studio website builder	[Through a supplier]	[Major]	[Critical]	28 Digital Agency, Nagoya City, Studio Inc., Chiba Prefectural Government, Hiroshima Prefecture, Nagano Prefectural Government, Money Forward, Inc., Niigata City, and US Inc., Hakky Inc., JIJ Inc., Link-U Group Inc., Luup, Inc., Money Forward Home, Inc., Money Forward Kessai, Inc., Money Forward X, Inc., RAKSUL Inc., ReFact Inc., Relic Inc., SmartHR, Inc., StoryHub Inc., Susaki City, Tamura City, ThinQ Healthcare Inc., Toho Gas Co., Ltd., Tohoku EPCO Frontier Co., Inc., TVer Inc., Zenmetry Corporation	Aichi, Chiba, Fukushima, Hiroshima, Kochi, Miyagi, Nagano, Niigata, Tokyo, Toyama	[Web app exploit]	[Data leak]	Unknown	[Investigating]