Sunstage: Belluna Notice breach may expose bank details of 19,853 customers
An intrusion through the application site may have exposed names and bank details of up to 19,853 Belluna Notice customers; the site is suspended.
Disclosed
2026-11-02
Organizations involved
1
Leaked or at risk
19.9K
19,853
Downtime
Unknown
What happened
Impact and response
Data linked to up to 19,853 customer IDs may have been exposed, including names, addresses, phone numbers, emails, bank accounts and contract details. The company has not confirmed that every record was viewed or taken. Passwords and identity-document images are excluded. Customer notifications began on 30 October, with reports to police and the Personal Information Protection Commission. [1]
Timeline
- Detected 2026-10-28
- Disclosed 2026-11-02
- 5 days
Attack or cause
- Method
- [Intrusion]
- Impact
- [Data leak][Service outage]
- Entry point
- Web app
Data exposed or at risk
Services hit
Organizations involved
[Breached][Critical]Saitama, AgeoFinance and insurance19,853 leaked
Sunstage Inc.
Sources
- [1][Official]ベルーナノーティスのサービス申込サイトへの不正アクセスに関するお詫びとお知らせSunstage · 2026-11-02