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Organizations involved in this incident2026-04-03YCC Information System: ransomware attackOpen the incident

7 results

GovernmentMunicipalityYamagata, Yamagata[Through a supplier][Critical]
Yamagata City
Incidents 2Latest 2026-10-21
CompanyTransport and postal servicesYamagata, Yamagata[Through a supplier][Critical]
Yamagata Kotsu Co., Ltd.
Incidents 1Latest 2026-04-03Employees 519
CompanyInformation and communicationsYamagata, Yamagata[Breached][Critical]
YCC Information System Inc.
Incidents 1Latest 2026-04-03
GovernmentPrefectureYamagata, Yamagata[Through a supplier][Major]
Yamagata Prefectural Government
Incidents 2Latest 2026-10-21
GovernmentMunicipalityYamagata, Shonai[Through a supplier][Major]
Shonai Town
Incidents 1Latest 2026-04-03
GovernmentMunicipalityYamagata, Takahata[Through a supplier][Major]
Takahata Town
Incidents 1Latest 2026-04-03
EducationEducation and learning supportYamagata, Yamagata[Through a supplier][Major]
Yamagata University
Incidents 1Latest 2026-04-03

	Role
Yamagata City	[Through a supplier]	[Critical]	Government	Municipality	Yamagata, Yamagata	–	–	2	2026-10-21
Yamagata Kotsu Co., Ltd.	[Through a supplier]	[Critical]	Company	Transport and postal services	Yamagata, Yamagata	519	–	1	2026-04-03
YCC Information System Inc.	[Breached]	[Critical]	Company	Information and communications	Yamagata, Yamagata	–	–	1	2026-04-03
Yamagata Prefectural Government	[Through a supplier]	[Major]	Government	Prefecture	Yamagata, Yamagata	–	–	2	2026-10-21
Shonai Town	[Through a supplier]	[Major]	Government	Municipality	Yamagata, Shonai	–	–	1	2026-04-03
Takahata Town	[Through a supplier]	[Major]	Government	Municipality	Yamagata, Takahata	–	–	1	2026-04-03
Yamagata University	[Through a supplier]	[Major]	Education	Education and learning support	Yamagata, Yamagata	–	–	1	2026-04-03