Every public data breach

Disclosed this week44On record26,355

44 disclosed this week · 26,355 on record

Missouri Department of Social Services

Disclosed Aug 7, 2023739,884 affectedConfirmed

Official notice

IBM MOVEit breach exposes Missouri Medicaid participants' data

Missouri's Department of Social Services said data it shared with vendor IBM, which provides Medicaid services support, was affected by the MOVEit breach, including names, client numbers, birth dates, benefit status and medical claims information.

What is known

People affected739,884 (as reported to HHS)
DisclosedAug 7, 2023
AttackVendor breach
Data exposedNamesDates of birthHealthInsuranceOther
SectorGovernment · US
StatusConfirmed
Part ofMoveit (2023)

Sources

Newstechcrunch.com
Millions of Americans' health data stolen after MOVEit hackers targeted IBM
Official noticeocrportal.hhs.gov
HHS OCR breach report (archive, resolved): Missouri Department of Social Services (Health Plan, MO)

Notices filed

TotalAug 7, 2023
HHS archive739,884 people
TotalAug 14, 2023
ResearchCount not stated

Same campaign

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chainEnergyDEUnverifiedJun 29, 2023National Student ClearinghouseMOVEit breach at student records nonprofit affects 890 schoolsSupply chainEducationUSJun 29, 2023Talcott ResolutionVendor PBI MOVEit breach exposes over half a million Talcott customersVendor breachInsuranceUSJun 27, 2023New York City Department of EducationMOVEit breach exposes data of about 45,000 NYC students and staffSupply chainEducationUSUnverifiedJun 26, 2023Jackson National Life InsuranceVendor PBI MOVEit breach exposes 700,000 to 800,000 Jackson customersVendor breach853K affectedInsuranceUSJun 26, 2023Corebridge FinancialVendor MOVEit breach exposes Corebridge customers' SSNs and policy numbersVendor breach6.5M affectedInsuranceUSJun 26, 2023Wilton ReassuranceVendor PBI MOVEit breach exposes 1.48 million insurance customersVendor breach1.5M affectedInsuranceUSJun 22, 2023Umpqua BankVendor and on-premise MOVEit breaches expose Umpqua customers' SSNsVendor breach429K affectedFinanceUSJun 22, 2023PBI Research ServicesMOVEit breach at pension death-audit vendor exposes millions of insurer customersSupply chainData brokersUSJun 22, 2023

Other breaches at Missouri Department of Social Services

Insider breachInsider exposed names and health records. Reported to the HHS archive.1,357 affectedHealthcareUSAug 2, 2013
History of this record
source_type2026-09-25
press to officialby backfillSource
source_url2026-09-25
https://techcrunch.com/2023/08/14/millions-americans-health-data-moveit-hackers-clop-ibm/ to https://ocrportal.hhs.gov/ocr/breach/breach_report.jsfby backfillSource
status2026-09-25
disclosed to confirmedby backfillSource
verified_by2026-09-25
empty to hhs-ocrby backfillSource
verified2026-09-25
0 to 1by backfillSource
records_basis2026-09-25
empty to hhsby backfillSource
records2026-09-25
empty to 739884by backfillSource
disclosed2026-09-25
2023-08-14 to 2023-08-07by backfillSource
Added2026-09-25
First recordedby seedSource

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

Everything about Missouri Department of Social Services