Cloud and hosting

ST Cloud Server Service

ST Cloud Server Service (run by STNet, Incorporated) was hit in 1 recorded cybersecurity incident. The latest was disclosed on 2025-11-21.

About the service

Website

https://www.stnet.co.jp/business/service/cloud/stcs/

Run by

Category

Cloud and hosting

For

Businesses

		Incident	Role	Impact level				Methods	Impacts		Status
2025-11-21	2026-02-09 08:05	STNet: unauthorized access to the dedicated network of its cloud server service may have leaked personal data of 20,846 corporate and organizational contacts	[Breached]	[Major]	[Major]	1 STNet, Incorporated	Kagawa	[Intrusion]	[Data leak]	20,846	[Resolved]

Other incidents of the operator (1)

		Incident				Methods	Impacts		Status
2026-06-23	2026-07-06	KDDI: unauthorized access to its mail system for ISPs	[Critical]	7 JCOM Co., Ltd., KDDI Corporation, BIGLOBE Inc., Chubu Telecommunications Co., Inc., KDDI Web Communications Inc., NIFTY Corporation, STNet, Incorporated	Aichi, Kagawa, Tokyo	[Intrusion]	[Data leak]	12,231,954	[Contained]