The medical records of about 300 Melbourne, Australia, high school students were mistakenly posted online exposing a variety of medical issues.

The data breach took place when on August 20 the information was posted in error to the schools intranet and remained viewable to the public for about 24 hours. The school is now investigating exactly how this took place and the school system has launched an investigation into the incident.

The data exposed included student physical and mental health conditions, medications and behavioral and learning difficulties.