Cornerstone Healthcare Group Management Services LLC
bd_88a92967dc0456b4 · schema v1 · pii pii-v1
Full breach record for Cornerstone Healthcare Group Management Services LLC →3 incidents on fileCornerstone Healthcare Group Management Services LLC experienced a data breach on December 19, 2023, involving unauthorized access to personal information of patients at certain supported healthcare facilities. The company detected suspicious network activity in mid-December 2023 and confirmed the breach. Personal information was determined to be impacted on May 30, 2024. The company contained the issue, contacted law enforcement, engaged cybersecurity firms, and is offering identity monitoring services.
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Incident timeline
Dec 19, 2023
Begins
Dec 19, 2023
Discovered
Nov 2, 2024
Filed
vs. sector median
+33 wks slower
Linked disclosures
Why this link?Regulatory filings (3) · sorted by filing gap
- Vermont State AGbd_28201747796ff0062024-11-01 · +1dVerified
- New Hampshire State AGbd_3ea79518fc5ab9ad2024-11-04 · +2dVerified
- New Hampshire State AGbd_5291e3d7b8c066a02024-11-06 · +4dVerified
Filing propagation · 4 filings · 3 states
View merged incident ↗Pattern: first filing Nov 1 (VT), last Nov 6 (NH) — a 5-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?
Evidence ladder
Attacker assertion only. Establishes: claim date, group, alleged victim.
Unlocks: incident narrative, operational impact. Still no compliance clock.
Unlocks: discovery date, data types, affected count, compliance clock.
Unlocks: materiality, stated response, full audit trail. Ceiling removed.