Overview
The notice gives "about 5.7 million" (Tabelog ~4.19M, Kakaku.com ~1.37M, Sumaity ~140k, Kyujinbox 142, icotto 4). Kakaku.com also includes birth date/gender for about 650,000 and icotto includes 2 user IDs. Count left blank as approximate. Email bodies were not involved. 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
- 業務委託先への不正アクセスに伴う当社サービスをご利用いただいているお客さまのメールアドレス漏えいについて株式会社カカクコム · 2026-11-09