> JapanHacked_
[Contained][Severity: Major][Intrusion]

Kohnan Hospital: intrusion into its website; personal data of about 124 people from the nursing inquiry form leaked

Names, birth dates, addresses, phones, schools and inquiry texts of about 124 people who used the nursing inquiry form leaked. Medical systems and care are not affected, it says.

Disclosed

2026-11-10

Organizations involved

1

Leaked or at risk

124

124

Downtime

Unknown

People affected or at risk

124

124

Discovery and response

On 30 October a burst of suspicious messages arrived through the website's inquiry form. The website management company detected unauthorized access and found traces of an outsider in the website system. The intrusion route and traffic from the attacker were blocked the same day. [1]

The leak covers about 124 people (as of 2 November) who used the nursing department's inquiry form: name, birth date, gender, email, address, phone, school graduated from or attending, and the inquiry text. The hospital reported to the Personal Information Protection Commission, the health ministry and the police. No impact on other medical systems has been found, and outpatient, inpatient and emergency care continue as normal. [1]

Timeline

  1. Detected 2026-10-30
  2. Disclosed 2026-11-10
  3. 11 days

Organizations involved

Sources

  1. [1][Official]当院ホームページへの不正アクセスによる個人情報漏洩に関するご報告とお詫び(第1報)Kohnan Hospital · 2026-11-10