MACT Health Board 2026 Data Breach
Healthcare / Tribal Community Health / Consumer
MACT Health Board 2026 Data Breach: Tribal Patient PHI Exposed via Ransomware
California non-profit tribal healthcare provider serving rural communities.
Confirmed · ObscureIQ Intelligence
Breach Risk Index i
100/100
Lower riskHigher risk
High and current: recent, valuable data circulating on the dark web now.
Data Sensitivity i
ElevatedExposed data raises the risk of fraud, targeting, and impersonation. Proactive steps are warranted.
551k rowsRecords
2026Year
The Breach Risk Index (BRI) is a proprietary 0–100 score rating how dangerous a breach is right now, based on how recently the data has been circulating on the dark web and how valuable it is to attackers.
Crucial data exposed
SSNSocial Security Number
PHI / MedicalMedical Diagnosis; Medical Record Number
Breach Summary
Between November 12 and 20, 2025 an unauthorized party accessed MACT Health Board's systems. Exposed data included names, Social Security numbers, driver's license numbers, medical record numbers and medical information for about 551,000 individuals. INC Ransom claimed the attack; Rhysida also claimed it and threatened to auction the data.
Full threat analysis, exploitation vectors, and principal guidance below.
9 additional sections · verified field analysis · defensive doctrine
Querying breach corpus…
Cross-referencing exposed field types…
Resolving threat-actor attribution…
Compiling principal risk advisory…
551k rows records analyzed
About MACT Health Board
MACT Health Board, Inc. is a California non-profit tribal healthcare provider delivering medical and dental services to rural and Native American communities.
Why They Hold Your Data
A tribal community health provider holds patient identity and contact data, SSNs, driver's-license numbers and clinical records (PHI).
Recent Developments
The breach was disclosed in 2026; INC Ransom claimed it, and the Rhysida group also claimed responsibility and posted sample identity documents.
Data Points Exposed
4 verified field types
Full Name
Medical Diagnosis Critical
Medical Record Number High
Social Security Number Critical
Breach Impact
As a HIPAA-covered tribal provider, the breach carries OCR notification and acute community-trust concerns; competing actor claims complicate attribution.
Principal Risk Advisory
What this means for a principal
A healthcare-linked breach: exposure ties a named individual to a provider relationship and, where clinical or insurance data is present, to conditions and treatment. For a high-profile principal this is targeting-grade, not merely identity-theft-grade: the combination lets an adversary locate, impersonate, or pressure the principal with little additional work.
What You Should Do
- Freeze credit at all three bureaus and monitor for new-account and tax-refund fraud.
- Watch for medical-benefit fraud and health-themed phishing that references real provider relationships.
- Do not use unofficial 'am I affected' lookups; several are themselves harvesting operations.
How ObscureIQ Can Help
- Corpus confirmation: determine whether and where the principal (plus household and staff) appear in this dataset and which specific fields are exposed for them.
- Exposure mapping: cross-reference the exposed identifiers against broker-available data to size and prioritize the principal's wider footprint.
- ThreatWatch tuned to this incident's identifiers and misuse pattern (impersonation and targeting patterns, not generic credential monitoring).
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