Cornerstone Healthcare Group Management Services LLC
bd_9098338e61d3b15b · 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, after detecting suspicious network activity in mid-December 2023. The incident involved unauthorized access to personal and health information of patients at certain healthcare facilities supported by Cornerstone. The company contained the issue, contacted law enforcement, and engaged cybersecurity firms. Affected individuals are offered credit monitoring and identity protection services through Kroll.
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Incident timeline
Dec 19, 2023
Begins
Dec 19, 2023
Discovered
Jul 1, 2024
Filed
vs. sector median
+16 wks slower
Linked disclosures
Why this link?Regulatory filings (3) · sorted by filing gap
- Montana State AGbd_200de4f01295e1852024-07-01Candidate
- Massachusetts State AGbd_09280395ee87b7fb2024-07-02 · +1dVerified
- New Hampshire State AGbd_097148949845f28d2024-07-08 · +7dVerified
Filing propagation · 4 filings · 4 states
View merged incident ↗Pattern: first filing Jul 1 (MT), last Jul 8 (NH) — a 7-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.