What Happened?

On October 14, 2026, Acclaim Health discovered a cybersecurity incident affecting some of its systems. Acclaim Health immediately took steps to secure its environment, contain the incident and engage external cybersecurity experts to assist with its response and investigation.

Acclaim Health has now fully contained the incident. While Acclaim Health’s operations were largely unaffected by this incident, we have resolved any limited impact and restored normal operations.

Acclaim Health provides community care services on behalf of Ontario Health atHome.

How Was Data Affected?

Our investigation to date has determined that an unauthorized actor encrypted personal health information (PHI) held on a local file server, rendering this data temporarily unavailable. A smaller amount of personal health information was also taken from this server. Personal health information of Acclaim Health and Ontario Health atHome patients was encrypted and taken as part of this incident.

Acclaim Health has successfully restored all encrypted data from backups, and all previously encrypted PHI is again available to Acclaim Health.

We are continuing to investigate the nature and extent of the incident, including the nature of the encrypted and taken PHI. Our electronic medical record was not affected. Our investigation remains ongoing, and we will provide further information as soon as possible.

What You Can Do

We have notified the Information and Privacy Commissioner of Ontario (IPC) of this incident. Individuals affected by this incident have a right to file a complaint with the IPC and can learn more by consulting their website at https://www.ipc.on.ca/en or by phone at 416-326-3333.  

Individuals who have questions or concerns about this incident may contact Acclaim Health at [email protected] or contact Joanne Hawkins, Privacy Officer, at 905-827-8800 ext. 2445.

Frequently Asked Questions

Q: How will I know whether my information was amongst the information that was taken?
A: The investigation is ongoing. Acclaim Health is working to determine what information was taken and which individuals are associated with that information. We do not want to speculate about whether a particular individual’s information was taken until that investigation is complete. Rest assured, that if your information was affected we will we notify you.

Q: When will affected individuals be notified?
A: Acclaim Health continues to investigate the nature and extent of the information taken. Appropriate notifications will be made based on the results of that investigation.