Business SaaS and e-mail

Chuden MDMS meter-data cloud service

Chuden MDMS meter-data cloud service (run by Chuden Telemetering LLC and Ryomo Systems Co., Ltd.) was hit in 1 recorded cybersecurity incident. The latest was disclosed on 2026-08-15.

About the service

Website

https://www.chudentm.co.jp/service/

Run by

Category

Business SaaS and e-mail

For

Businesses

Incident history

Disclosed 2026-08-15Updated 2026-11-06Aichi, Gunma, Mie, Nagano, Saitama[Investigating][Severity: Critical][Through a supplier][Critical]
Ryomo Systems: ransomware puts clients’ customer data and student account details at risk
[Ransomware][Credential abuse][Data leak]Leaked 124KOrganizations 6

		Incident	Role	Impact level				Methods	Impacts		Status
2026-08-15	2026-11-06	Ryomo Systems: ransomware puts clients’ customer data and student account details at risk	[Through a supplier]	[Critical]	[Critical]	6 Isesaki City, Ryomo Systems Co., Ltd., Daito Gas Inc., Chuden Telemetering LLC, Nabari Kintetsu Gas Inc., Nagano Toshi Gas Inc.	Aichi, Gunma, Mie, Nagano, Saitama	[Ransomware][Credential abuse]	[Data leak]	124,000	[Investigating]