Overview
Notifications began May 20, 2026. Ransomware groups claimed the attacks but the company has not confirmed this, so the method is recorded as unknown. No total is given. The first-disclosure date is the earliest public document confirmed (California AG posting); no 2025 public disclosure was found in other state AG lists, HHS or company notices checked.
Timeline
- Occurred
- Discovered
- Disclosed
Organization response
Per the notice, the organisation investigated and contained the incident, notified individuals and offered monitoring or protective resources.
What you can do
Verify notices through official channels, avoid links in unexpected messages, do not provide credentials, and review credit reports and statements.
Sources
- Sample consumer notice filed with California AG (Cardinal Services, Inc, Cardinal Employer Organization, and Preferred Employer Solutions, collectively (“Cardinal”))California Department of Justice, Office of the Attorney General · 2026-11-09
- California AG data breach report: Cardinal Services, Inc, Cardinal Employer Organization, and Preferred Employer Solutions, collectively (“Cardinal”)California Department of Justice, Office of the Attorney General · 2026-11-09
- Cardinal Services: Notice of Data Security IncidentCardinal Services · 2026-11-09