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Montana Department of Public Health and Human Services

Disclosed Jul 7, 20141,062,509 affectedConfirmed

Official notice

Unpatched server hacked for nine months exposes data of 1 million Montanans

An undetected, unpatched application vulnerability let an intruder misuse a state health department server for about nine months, exposing demographic, clinical and financial data of over 1 million people.

What is known

People affected1,062,509 (as reported by the organization)
DisclosedJul 7, 2014
AttackHacking
Data exposedNamesAddressesDates of birthSocial Security numbersHealthFinancial
SectorGovernment · US
StatusConfirmed

Sources

Notices filed

History of this record
Added2026-09-25
First recordedby seedSource

First seen 2026-09-25 (Research), confirmed by Research. Record counts are as reported. Not legal advice.

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