Overview
158,600 email addresses of people who received mail through the service between October 9 and 29, 2026. No names, phones or message bodies. 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.
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
- 当社委託先のメール配信サービスにおける情報漏えいについてマンパワーグループ株式会社 · 2026-11-09