HackingHealthcareHealthcareData ExfiltratedCustomer Data InvolvedGovernment IDIdentity (basic)HighContained

The Cooper Health System

bd_e7c6f6c60497b58e · schema v1 · pii pii-v1

Severity

High

Discovered

May 1, 2024

Filed

May 23, 2025

To disclose

13 months

Affected · nationwide

57,4121 in this filing

Linked

4 filings

Confidence

66%

Full breach record for The Cooper Health System →2 incidents on file

The Cooper Health System experienced an external system breach (hacking) in May 2024, discovered in May 2024, with confirmation of impacted data on March 26, 2025. Approximately 57,412 individuals were affected, including 1 Maine resident. Personal information (names and Social Security numbers) was potentially acquired. Cooper engaged cybersecurity experts, secured its environment, and offered 12 months of credit/identity monitoring to affected individuals.

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Maine clockDiscovered May 1, 2024 → Filed with AG May 23, 2025387d ✗ ME AG >90d13 months discovery → filing

⚠ unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Incident timeline

May 14, 2024

Begins

May 23, 2025

Filed

vs. sector median

+44 wks slower

This filing is one of 4 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (3) · sorted by filing gap

New Hampshire State AGbd_0e52e3d43f302b7c2025-05-23Verified
Indiana State AGbd_12fc54c1204931472025-05-23Verified
HHS OCRbd_1334d8b37970129d2025-05-23Verified

Name: Constangy, Brooks, Smith & Prophete, LLP
norm: constangy brooks smith prophete

Name: The Cooper Health System
norm: the cooper health system
Industry: Healthcarellm

Discovered: May 1, 2024
Breach occurred: May 14, 2024
Materiality determined: —
Notification sent: May 23, 2025
Affected individuals: 57,412state + nationwide
Data types: Government IDIdentity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing Application
Threat actor: ExternalFinancial
Regulator citations: Submitted Security Breach Notification to Maine Attorney General
Initial access: exploit_public_facing

During the incident: Engaged independent cybersecurity experts to conduct an investigation
Took immediate steps to secure its environment
Offered complimentary credit and identity protection monitoring services
Changes made: Implementing additional security protocols
Offering complimentary credit and identity protection monitoring services
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 13 months(387 days from discovery to filing)
Compliance flags: ME AG >90d · 387dME resident >180d · 387d
Discovery-date grounding: unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.
Clock breakdown: Statute Window Elapsed Threshold Status
Maine
Discovered: May 1, 2024
→ Filed with AG: May 23, 2025
387d 90 days ME AG >90d
Maine
Discovered: May 1, 2024
→ Notified: May 23, 2025
387d 180 days ME resident >180d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: May 1, 2024 → Filed with AG: May 23, 2025	387d	90 days	ME AG >90d
Maine	Discovered: May 1, 2024 → Notified: May 23, 2025	387d	180 days	ME resident >180d

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 4 states

View merged incident ↗

New Hampshire State AGMay 23 · first

Indiana State AGMay 23 · first

HHS OCRMay 23 · first

Maine State AGMay 23 · first · this page

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://www.maine.gov/agviewer/content/ag/985235c7-cb95-4be2-8792-a1252b4f8318/00e705cf-30ba-4dd1-aa72-82e50be98ac9.html
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: May 23, 2025
Raw hash: ee442738404ecc9dd36b2dc29d073b1dd8e6752f0a30f02fcf4203f2ad022205

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityConstangy, Brooks, Smith & Prophete, LLP

Victim entityThe Cooper Health System

Incidentdiscovered May 1, 2024

Stated responseEngaged independent cybersecurity experts to conduct an investigation

ComplianceME AG >90d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov