> JapanHacked_Cybersecurity incidents in Japan

Company

Sumitomo Mitsui Banking Corporation

Sumitomo Mitsui Banking Corporation (Chiyoda, Tokyo; Finance and insurance) appears in 1 related cybersecurity incident. The latest was disclosed on 2020-05-01.

Profile

Industry/type: Finance and insurance
Location: Tokyo, Chiyoda
Also known as: SMBC
Website: https://www.smbc.co.jp/

Public figures

Employees24,321Non-consolidated2026-09-15
METI: Gビズインフォ

Metric	Value	Scope	As of	Source
Employees	24,321	Non-consolidated	2026-09-15	METI: Gビズインフォ

Incident history

Disclosed 2020-05-01Updated 2020-05-07 09:00Tokyo[Resolved][Severity: Moderate][Through a supplier][Moderate]
SMBC: its maintenance contractor lost two hard disks holding about 70,000 Kasai branch transactions
[Lost device][Data leak]Leaked 70KOrganizations 2

		Incident	Role	Impact level				Methods	Impacts		Status
2020-05-01	2020-05-07 09:00	SMBC: its maintenance contractor lost two hard disks holding about 70,000 Kasai branch transactions	[Through a supplier]	[Moderate]	[Moderate]	2 Sumitomo Mitsui Banking Corporation, OKI CrossTech Co., Ltd.	Tokyo	[Lost device]	[Data leak]	70,000	[Resolved]