Overview
305 email addresses mailed October 8-29. Names, purchase data, subjects and bodies not included. This stems from the Arara email-platform intrusion (recorded separately); the figure is a subset of the vendor scope and must not be added to it.
Timeline
- Occurred
- Discovered
- Disclosed
Organization response
Per the notice, the organisation investigated and contained the incident, notified individuals and offered monitoring or protective resources.
What you can do
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.
Sources
- メール配信委託先への不正アクセスに伴う個人情報の漏洩に関するお詫びとお知らせ（第一報）株式会社はせがわ · 2026-11-09