> JapanHacked_Cybersecurity incidents in Japan

Company

Gakusan Inc.

Gakusan Inc. (Meito, Nagoya, Aichi; Education and learning support) appears in 1 related cybersecurity incident. The latest was disclosed on 2026-05-15.

Profile

Industry/type: Education and learning support
Location: Aichi, Nagoya, Meito
Website: https://aozora.com/

Public figures

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Metric	Value		As of	Source
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Incident history

Disclosed 2026-05-15Updated 2026-10-23Aichi[Contained][Severity: Critical][Breached][Critical]
CKC Network and Gakusan: ransomware attack on the inquiry system
[Ransomware][Web app exploit][Data leak]Leaked 664KOrganizations 2

		Incident	Role	Impact level				Methods	Impacts		Status
2026-05-15	2026-10-23	CKC Network and Gakusan: ransomware attack on the inquiry system	[Breached]	[Critical]	[Critical]	2 CKC Network Inc., Gakusan Inc.	Aichi	[Ransomware][Web app exploit]	[Data leak]	664,000	[Contained]