> JapanHacked_
[Investigating][Severity: Critical][Intrusion][Malware]

Medley: unauthorized access to the @link clinic system

Attackers accessed @link, Medley's system for clinics such as obstetrics and gynecology, along with its patient app. An outside specialist alerted Medley on 11 October, and Medley confirmed the access. It stopped the services late on 14 October, so web booking and digital patient cards stopped working. Patient data may have leaked; up to 787 medical institutions could be affected. Its October 22 update at 10:00 said the planned phased restart of some clinic functions from 07:00 was delayed by a fault and had no revised start estimate. On October 23 Medley said it had confirmed that, from late September to mid-October, a third party used a planted program to take data from its database. For users of the app and web booking, names, name readings, birth month and day, email addresses, login IDs and passwords, clinic names, registration and last visit dates, and card payment dates and amounts leaked. Other patients' names, birth month and day, clinic names, login IDs and initial passwords were affected too. The number of people is still being counted.

Disclosed

2026-10-15

Organizations involved

1

Leaked or at risk

Unknown

Downtime

Unknown

Timeline

  1. Detected 2026-10-11
  2. Disclosed 2026-10-15
  3. 4 days

Services hit

Organizations involved

Open in organization search

Sources

  1. [1][Official]アットリンクへの不正アクセスおよびサービスの一時停止に関する最新情報Medley · 2026-10-15
  2. [2][News]メドレーの産婦人科向けシステムに不正アクセス、患者の個人情報漏えいか 最大787の医療機関が対象ITmedia NEWS · 2026-10-15
  3. [3][Official]アットリンクへの不正アクセスに関する調査状況についてMedley · 2026-10-23