Company

Seibu Railway Co., Ltd.

Seibu Railway Co., Ltd. (Toshima, Tokyo; Transport and postal services) appears in 1 related cybersecurity incident. The latest was disclosed on 2026-09-02.

Profile

Industry/type

Transport and postal services

Location

Tokyo, Toshima

Brands

52 Seats of Happiness

Website

https://www.seiburailway.jp/

Public figures

–

Metric	Value		As of	Source
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Incident history

Disclosed 2026-09-02Updated 2026-10-23Tokyo[Resolved][Severity: Critical][Breached][Critical]
Seibu Railway: 52 Seats of Happiness booking data viewable from outside
[Misconfiguration][Data leak]Leaked 500Organizations 1

		Incident	Role	Impact level				Methods	Impacts		Status
2026-09-02	2026-10-23	Seibu Railway: 52 Seats of Happiness booking data viewable from outside	[Breached]	[Critical]	[Critical]	1 Seibu Railway Co., Ltd.	Tokyo	[Misconfiguration]	[Data leak]	500	[Resolved]