Cloud and hosting

WebARENA large file transfer

WebARENA large file transfer (run by NTTPC Communications, Inc.) was hit in 1 recorded cybersecurity incident. The latest was disclosed on 2026-06-23.

About the service

Website

https://help.arena.ne.jp/hc/ja/articles/360025372754

Run by

NTTPC Communications, Inc.

Category

Cloud and hosting

For

Businesses

Incident history

Disclosed 2026-06-23Updated 2026-06-25 08:05Tokyo[Ongoing][Severity: Major][Breached][Major]
NTTPC Communications: part of the servers behind its "WebARENA" large-file transfer function were breached and the function was stopped; it is expected to resume around December 2026
[Intrusion][Service outage]Organizations 1

		Incident	Role	Impact level				Methods	Impacts		Status
2026-06-23	2026-06-25 08:05	NTTPC Communications: part of the servers behind its "WebARENA" large-file transfer function were breached and the function was stopped; it is expected to resume around December 2026	[Breached]	[Major]	[Major]	1 NTTPC Communications, Inc.	Tokyo	[Intrusion]	[Service outage]	Unknown	[Ongoing]

Other incidents of the operator (1)

Disclosed 2026-10-19Updated 2026-10-28Aichi, Fukuoka, Kanagawa, Osaka, Saitama, Tokyo[Investigating][Severity: Critical]
Ymirlink: break-in at the Cuenote FC email delivery service exported about 51.6 million records from 49 customer systems
[Web app exploit][Data leak]Leaked 51.6MOrganizations 31

		Incident				Methods	Impacts		Status
2026-10-19	2026-10-28	Ymirlink: break-in at the Cuenote FC email delivery service exported about 51.6 million records from 49 customer systems	[Critical]	31 Central Japan Railway Company, Kyushu Railway Company, West Japan Railway Company, Bandai Namco Entertainment Inc., BANDAI SPIRITS Co., Ltd., Life Card Co., Ltd., Rise UP Co., Ltd., Ymirlink, Inc., Dai Nippon Printing Co., Ltd., DCM Co., Ltd., Nomura Securities Co., Ltd., Saitama Prefecture, istyle Inc., NTTPC Communications, Inc., Animate Ltd., The Asahi Shimbun Company, ASMARQ Co., Ltd., Cybozu, Inc., Impress Corporation, Japan Association for Financial Planners, JMA Management Center Inc., Kansai Mirai Bank, Limited, The Mainichi Newspapers Co., Ltd., Persona Co., Ltd., Resona Bank, Limited, Saitama Resona Bank, Limited, Satofull Co., Ltd., Sendenkaigi Co., Ltd., Sourcenext Corporation, Syuppin Co., Ltd., ValueCommerce Co., Ltd.	Aichi, Fukuoka, Kanagawa, Osaka, Saitama, Tokyo	[Web app exploit]	[Data leak]	51,628,280	[Investigating]