Overview
Possible fields: member codes, emails, birth dates, gender, prefecture, favourite stores and kids' birthday data. Names, addresses, phones, passwords and cards are not held. Headcount still under investigation (count blank).
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
- 【重要】デニーズアプリへの不正アクセスに関するお詫びとお知らせ（第一報）株式会社デニーズジャパン · 2026-11-09