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Cornerstone Behavioral Healthcare Data Breach Lawsuit Investigation
Shamis & Gentile P.A., one of the nation's premier class action law firms specializing in data breach cases, is investigating the Cornerstone Behavioral Healthcare data breach.
If you were affected by the data breach, your sensitive personally identifiable information may have been exposed, and you may be eligible for compensation.
About Cornerstone Behavioral Healthcare
Cornerstone Behavioral Healthcare is a Maine-based provider that has offered behavioral health services since 2008. With outpatient offices in Waterville and Bangor, the organization serves clients across the state of Maine.
The organization provides a range of services, including mental health care and substance use disorder treatment.
What Happened?
On May 26, 2026, Cornerstone Behavioral Healthcare discovered a ransomware attack affecting its computer systems.
The attack began and was identified on the same day, and Cornerstone was able to suspend the attackers' access within an hour.
An investigation revealed that less than 10 percent of the data on affected systems was encrypted before the systems were powered down. Initially, Cornerstone identified that the personal and health information of approximately 2,830 individuals may have been compromised.
Later, on July 22, 2026, the company discovered that appointment reminder logs for an additional 12,000 individuals may have been accessed.
In total, the breach affected 14,830 people in the United States.
Information Exposed:
- Names
- Addresses
- Other contact information
- Dates of birth
- Health care information
- Substance use disorder treatment information
- Insurance/MaineCare information
- Social security numbers
- Appointment times
- Reminders of documentation due
Cornerstone reported the breach to the U.S. Department of Health and Human Services on July 27, 2026.
You May Be Entitled to Compensation
If your information was exposed in the Cornerstone Behavioral Healthcare data breach, you may be entitled to compensation for the risks and harms resulting from this incident.
Lawyers are ready to help individuals understand their rights and pursue possible legal claims. To find out if you qualify and to join others taking action, complete the below form to get started.
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