Daimaru Matsuzakaya Department Stores: other members' details shown in the app and online stores
On 1 October, Daimaru Matsuzakaya Department Stores said a system fault had shown other members' details on some member pages of the Daimaru Matsuzakaya app, its online store and DEPACO. It identified 581 members who may have been affected, contacted them by email and hid the affected member details. It said the fault had been fixed.
Disclosed
2026-10-01
Organizations involved
1
Leaked or at risk
581
581
Downtime
Unknown
Timeline
- Disclosed 2026-10-01
- 1 days
Attack or cause
- Method
- [Unknown]
- Impact
- [Data leak]
- Entry point
- Unknown
Data exposed or at risk
–
Organizations involved
[Breached][Major]Tokyo, KotoWholesale and retail trade581 leaked
Daimaru Matsuzakaya Department Stores Co., Ltd.
Sources
- [1][Official]大丸・松坂屋アプリ、大丸松坂屋オンラインストアおよびＤＥＰＡＣＯの会員情報の表示不具合に関するお詫びとお知らせDaimaru Matsuzakaya Department Stores · 2026-10-01