Social EngineeringHealthcareFinancial ServicesHealthcarePhishingData ExfiltratedCustomer Data InvolvedFinancial accountHealth (basic)Identity (basic)Government IDMediumContained

Quantum Health, Inc.

bd_73b571b03dc8be54 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jun 1, 2026

Filed

Jul 30, 2026

To disclose

8 weeks

Affected

1state residents only

Linked

9 filings

Confidence

65%

Full breach record for Quantum Health, Inc. →

Quantum Health, Inc. notified Massachusetts residents of a data breach involving unauthorized access to its IT network. The incident was triggered by a vishing call on May 29, 2026, leading to the exfiltration of personal and health information, including SSNs and insurance details. The breach was discovered on June 1, 2026, and notifications were sent on July 8, 2026. Quantum Health engaged forensic experts and is offering complimentary identity monitoring services.

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Massachusetts clock⏱ MA AG >30d8 weeks discovery → filing

Incident timeline

undetected · 3 days

discovery → filing · 8 weeks / 59 days

May 29, 2026

Begins

Jun 1, 2026

Discovered

Jul 30, 2026

Filed

vs. sector median

3 wks faster

This filing is one of 9 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (8) · sorted by filing gap

HHS OCRbd_057652d229111d6b2026-07-29 · +1dVerified
New Hampshire State AGbd_6fe352feb65bd2de2026-07-29 · +1dVerified
Washington State AGbd_5b6eaf5624db3f052026-08-14 · +15dVerified
Oregon State AGbd_94e0ec22967674672026-08-14 · +15dVerified

Show 4 more filings ↓up to 29d gap

California State AGbd_db3f1eec26c6984d2026-08-14 · +15dVerified
South Carolina State AGbd_2fccf5512e3736a82026-08-17 · +18dVerified
Texas State AGbd_bcba8d4a1d35228f2026-08-18 · +19dVerified
Illinois State AGbd_e021fcb45440ad832026-07-01 · +29dCandidate

Name: Quantum Health, Inc.
norm: quantum health

Name: Quantum Health, Inc.
norm: quantum health
Industry: HealthcarellmFinancial Servicesllm

Discovered: Jun 1, 2026
Breach occurred: May 29, 2026 – Jun 1, 2026
Undetected for: 3 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jul 8, 2026
Affected individuals: 1state-resident count only
Data types: Financial accountHealth (basic)Identity (basic)Government ID
Data elements: Social Security numberDate of birthMedical information
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid Accounts
Threat actor: ExternalFinancial
Initial access: phishing_link

During the incident: Secured and isolated systems
Launched an investigation with the support of third-party forensics experts
Offering identity monitoring through Kroll at no cost
Changes made: Enhancing existing security protocols
Implementing additional security measures
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 8 weeks(59 days from discovery to filing)
Compliance flags: MA AG >30d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 9 filings · 9 states

View merged incident ↗

Illinois State AGJul 1 · first

HHS OCR+28d

New Hampshire State AG+28d

Massachusetts State AG+29d · this page

Washington State AG+44d

Oregon State AG+44d

California State AG+44d

South Carolina State AG+47d

Texas State AG+48d

Pattern: first filing Jul 1 (IL), last Aug 18 (TX) — a 48-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

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.mass.gov/doc/2026-1250-quantum-health-inc/download
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jul 30, 2026
Raw hash: e7a043274db22b9ac3f094408220bd3f43ae093813e7a4f8ad064b9f0a2fe836

Linked disclosures

Regulatory filings (8) · sorted by filing gap

Reporting entityQuantum Health, Inc.

Victim entityQuantum Health, Inc.

Incidentdiscovered Jun 1, 2026

Stated responseSecured and isolated systems

ComplianceMA AG >30d

Extraction provenanceno artifact recorded

Source provenancewww.mass.gov