Government

Cabinet Office

Cabinet Office (Chiyoda, Tokyo; National government) appears in 2 related cybersecurity incidents. The latest was disclosed on 2026-04-28.

Profile

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Metric	Value	Scope	As of	Source
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		Incident	Role	Impact level				Methods	Impacts		Status
2026-04-28	2026-05-01 08:05	Cabinet Office Okinawa General Bureau: its dedicated FileZen server was breached and personal data it held may have leaked	[Breached]	[Moderate]	[Moderate]	1 Cabinet Office	Tokyo	[Intrusion]	[Data leak]	Unknown	[Investigating]
2021-04-22	2021-04-28 08:00	Cabinet Office: the FileZen file sharing storage used by its staff came under a zero-day attack, and non-public data on 231 people may have leaked	[Breached]	[Critical]	[Critical]	2 Cabinet Office, Cabinet Secretariat	Tokyo	[Intrusion]	[Data leak]	Unknown	[Resolved]