Dear Care: break-in at an outside system behind its nursing and care site altered program code; all services stopped
An outside system used by the Dear Care nursing and care information site was broken into and its program code altered. All services have been stopped since 24 October.
Disclosed
2026-10-26
Organizations involved
1
Leaked or at risk
Unknown
Downtime
Unknown
What happened
From that night to the next morning, an outside system the company uses was accessed without authorization. [1]
The company noticed late that night. [1]
At 22:00 all Dear Care and Dear Care Premium services were stopped. [1]
First report. [1]
The second report said part of the program code had been improperly changed. [1]
Impact
No leak of users' personal data has been confirmed, but one cannot be ruled out. No date for reopening has been set. [1]
Response
The cause and scope are being investigated with the system vendors, and services will reopen once confirmed safe. Users are warned about emails pretending to come from the company. [1]
Timeline
- Started 2026-10-20
- Detected 2026-10-23
- Disclosed 2026-10-26
- 6 days
Attack or cause
- Method
- [Intrusion]
- Impact
- [Service outage]
- Entry point
- Unknown
Data exposed or at risk
–
Services hit
Organizations involved
[Breached][Major]Tokyo, SumidaInformation and communications
DEARCARE Co., Ltd.
Sources
- [1][Official]第三者による不正アクセスに関する調査状況のお知らせ（第二報）Dear Care · 2026-10-28