JR EastEkinet and Otona no Kyujitsu Club

1MinorInvestigatingAnnounced Updated

JR East said an external email delivery vendor reported on October 15 that member information was not leaked. This follows its October 9 notice of a possible leak after an attack on IDC Frontier.

This incident was imported from a dataset that compiles public announcements, and we are still checking it against the sources. Counts and causes will be updated after the check. Sources are in Japanese.

Cause
Via a vendor or service
Sector
Transport & logistics
Operational impact
None

Sources

  1. IDCフロンティア社で発生した不正アクセスに伴うメール配信用外部サービスからのメールアドレス等の漏えい可能性についてwww.jreast.co.jp · Published 2026-10-09(opens in a new tab)
  2. IDCフロンティア社で発生した不正アクセスに伴うメール配信用外部サービスからのメールアドレス等の漏えい可能性について(10月15日更新)www.jreast.co.jp · Published 2026-10-15(opens in a new tab)