Education

Hosei University

Hosei University (Chiyoda, Tokyo; Education and learning support) appears in 2 related cybersecurity incidents. The latest was disclosed on 2025-08-06.

Profile

Industry/type: Education and learning support
Location: Tokyo, Chiyoda
Website: https://www.hosei.ac.jp/

Public figures

–

Metric	Value	Scope	As of	Source
–

Incident history

Disclosed 2025-08-06Updated 2025-08-21 08:05Tokyo[Resolved][Severity: Major][Through a supplier][Major]
Hosei University: an attack on its contractor Nippon Steel Solutions may have leaked the names and email addresses of 16,542 students and staff
[Web app exploit][Data leak]Organizations 2
Disclosed 2024-12-12Updated 2024-12-26 08:05Tokyo[Resolved][Severity: Major][Breached][Major]
Hosei University: a faculty member saved personal data to a shared file server by mistake, making data of 1,683 people viewable by students and staff
[Misconfiguration][Data leak]Organizations 1

		Incident	Role	Impact level				Methods	Impacts		Status
2025-08-06	2025-08-21 08:05	Hosei University: an attack on its contractor Nippon Steel Solutions may have leaked the names and email addresses of 16,542 students and staff	[Through a supplier]	[Major]	[Major]	2 NS Solutions Corporation, Hosei University	Tokyo	[Web app exploit]	[Data leak]	Unknown	[Resolved]
2024-12-12	2024-12-26 08:05	Hosei University: a faculty member saved personal data to a shared file server by mistake, making data of 1,683 people viewable by students and staff	[Breached]	[Major]	[Major]	1 Hosei University	Tokyo	[Misconfiguration]	[Data leak]	Unknown	[Resolved]