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Gakken: group customer personal data leaked via Arara email-delivery contractor breach

Gakken Holdings announced a first report on November 5 after being told that unauthorised access to Arara, which handles group email delivery, leaked some customer personal data.

最后更新: 2026-11-09

此内容以 English 显示。

概述

Counts and fields are under investigation (count blank). Data feeds were stopped and delivery switched. Per the company, this stems from unauthorised access to the Arara email-delivery platform (recorded separately); this figure is a subset of the vendor scope and must not be added to it.

时间线

未知发生
未知发现
2026-11-05披露

组织应对措施

Per the notice, the organisation investigated and contained the incident, notified individuals and offered monitoring or protective resources.

用户应对建议

Be wary of emails, SMS or calls impersonating the organisation; do not open links or attachments or enter passwords or card details. Change reused passwords on other services.

信息来源

委託先メール配信サービスへの不正アクセスによる個人情報漏えいに関するお知らせとお詫び（第１報）株式会社学研ホールディングス · 2026-11-09