> JapanHacked_Cybersecurity incidents in Japan

Company

YCC Information System Inc.

YCC Information System Inc. (Yamagata, Yamagata; Information and communications) appears in 1 related cybersecurity incident. The latest was disclosed on 2026-04-03.

Profile

Industry/type: Information and communications
Location: Yamagata, Yamagata
Website: https://www.yamagata-ycc.co.jp/

Public figures

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Metric	Value		As of	Source
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Incident history

Disclosed 2026-04-03Updated 2026-10-23Yamagata[Contained][Severity: Critical][Breached][Critical]
YCC Information System: ransomware attack
[Ransomware][Credential abuse][Data leak][Service outage]Leaked 121.9KOrganizations 7

		Incident	Role	Impact level				Methods	Impacts		Status
2026-04-03	2026-10-23	YCC Information System: ransomware attack	[Breached]	[Critical]	[Critical]	7 Yamagata City, Yamagata Kotsu Co., Ltd., YCC Information System Inc., Yamagata Prefectural Government, Shonai Town, Takahata Town, Yamagata University	Yamagata	[Ransomware][Credential abuse]	[Data leak][Service outage]	121,880	[Contained]