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SEIBU PRINCE CLUB

SEIBU PRINCE CLUB (run by Seibu Holdings Inc.) was hit in 1 recorded cybersecurity incident. The latest was disclosed on 2026-11-02 14:00.

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https://club.seibugroup.jp/

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		Incident	Role	Impact level				Methods	Impacts		Status
2026-11-02 14:00	2026-11-09	WILLs: NetMile breach may expose names and email addresses of up to about 5.49 million people	[Through a supplier]	[Major]	[Critical]	2 WILLs Inc., Seibu Holdings Inc.	Tokyo	[Intrusion]	[Data leak][Service outage]	5,490,000	[Investigating]