> JapanHacked_Cybersecurity incidents in Japan

Education

Tokai University Educational System

Tokai University Educational System (Shibuya, Tokyo; Education and learning support) appears in 2 related cybersecurity incidents. The latest was disclosed on 2025-11-13.

Profile

Industry/type: Education and learning support
Location: Tokyo, Shibuya
Also known as: Tokai University
Website: https://www.tokai.ac.jp/

Public figures

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Metric	Value		As of	Source
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Incident history

Disclosed 2025-11-13Updated 2026-10-23Tokyo[Contained][Severity: Critical][Through a supplier][Critical]
Tokai Software Development: ransomware leaks Tokai University data
[Ransomware][Credential abuse][Data leak][Service outage]Leaked 193.1KOrganizations 2
Disclosed 2025-04-18Updated 2026-10-23Tokyo[Contained][Severity: Critical][Breached][Critical]
Tokai University: ransomware disrupts systems
[Ransomware][Service outage]Organizations 1

		Incident	Role	Impact level				Methods	Impacts		Status
2025-11-13	2026-10-23	Tokai Software Development: ransomware leaks Tokai University data	[Through a supplier]	[Critical]	[Critical]	2 Tokai Software Development Co., Ltd., Tokai University Educational System	Tokyo	[Ransomware][Credential abuse]	[Data leak][Service outage]	193,118	[Contained]
2025-04-18	2026-10-23	Tokai University: ransomware disrupts systems	[Breached]	[Critical]	[Critical]	1 Tokai University Educational System	Tokyo	[Ransomware]	[Service outage]	Unknown	[Contained]