> JapanHacked_Cybersecurity incidents in Japan

Company

Gakken Medical Support Co., Ltd.

Gakken Medical Support Co., Ltd. (Shinagawa, Tokyo; Information and communications) appears in 2 related cybersecurity incidents. The latest was disclosed on 2026-10-08.

Profile

Industry/type: Information and communications
Location: Tokyo, Shinagawa
Website: https://gakken-meds.jp/

Public figures

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Metric	Value		As of	Source
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Incident history

Disclosed 2026-10-08Updated 2026-10-26 18:25Tokyo[Contained][Severity: Moderate][Through a supplier][Moderate]
Gakken: group sites down after unauthorized access to an external server
[Intrusion][Service outage]Organizations 3
Disclosed 2025-11-11Updated 2026-10-23Tokyo[Contained][Severity: Major][Breached][Major]
Gakken Medical Support: account permission error
[Misconfiguration][Data leak]Leaked 600Organizations 1

		Incident	Role	Impact level				Methods	Impacts		Status
2026-10-08	2026-10-26 18:25	Gakken: group sites down after unauthorized access to an external server	[Through a supplier]	[Moderate]	[Moderate]	3 Gakken Educational Co., Ltd., Gakken Inc., Gakken Medical Support Co., Ltd.	Tokyo	[Intrusion]	[Service outage]	Unknown	[Contained]
2025-11-11	2026-10-23	Gakken Medical Support: account permission error	[Breached]	[Major]	[Major]	1 Gakken Medical Support Co., Ltd.	Tokyo	[Misconfiguration]	[Data leak]	600	[Contained]