Company

Japan Post Holdings Co., Ltd.

Japan Post Holdings Co., Ltd. (Chiyoda, Tokyo; Transport and postal services) appears in 1 related cybersecurity incident. The latest was disclosed on 2026-10-19.

Profile

Industry/type

Transport and postal services

Location

Tokyo, Chiyoda

Services

Yu ID

Listing

TSE Prime 6178

Website

https://www.japanpost.jp/

Group companies

Japan Post Co., Ltd.

Public figures

Employees1,261Non-consolidated2026-03-31
METI: Gビズインフォ
Revenue¥199.4BNon-consolidated2026-03-31
METI: Gビズインフォ
Capital¥1.8TNon-consolidated2026-03-31
METI: Gビズインフォ

Metric	Value		As of	Source
Employees	1,261	Non-consolidated	2026-03-31	METI: Gビズインフォ
Revenue	¥199.4B	Non-consolidated	2026-03-31	METI: Gビズインフォ
Capital	¥1.8T	Non-consolidated	2026-03-31	METI: Gビズインフォ

Incident history

Disclosed 2026-10-19Updated 2026-10-23Tokyo[Contained][Severity: Major][Breached][Major]
Japan Post Holdings: credential stuffing against Yu ID
[Credential abuse][Data leak][Service outage]Leaked 249Organizations 1

		Incident	Role	Impact level				Methods	Impacts		Status
2026-10-19	2026-10-23	Japan Post Holdings: credential stuffing against Yu ID	[Breached]	[Major]	[Major]	1 Japan Post Holdings Co., Ltd.	Tokyo	[Credential abuse]	[Data leak][Service outage]	249	[Contained]