Every public data breach

Disclosed this week44On record26,355

44 disclosed this week · 26,355 on record

CareSource

Disclosed Jul 27, 20233,180,537 affectedConfirmed

Official notice

MOVEit hack exposes CareSource members' health and personal data

Managed care insurer CareSource said MOVEit software it used to manage member benefits was hacked on May 31, 2023, and data including Social Security numbers, member IDs, diagnoses and medications was copied.

What is known

People affected3,180,537 (as reported to HHS)
DisclosedJul 27, 2023
DiscoveredJun 27, 2023
HappenedMay 31, 2023
AttackSupply chain
Data exposedNamesAddressesDates of birthSocial Security numbersHealthInsurance
SectorHealthcare · US
StatusConfirmed
Part ofMoveit (2023)

Sources

Official noticeoag.ca.gov
California Attorney General breach notice: CareSource
Official noticeatg.wa.gov
Washington Attorney General breach notice: CareSource
Regulatoroag.ca.gov
California AG breach notice: CareSource
Official noticeocrportal.hhs.gov
HHS OCR breach report (archive, resolved): CareSource (Business Associate, OH)

Notices filed

TotalJul 27, 2023
HHS archive3,180,537 people
Residents of CAAug 28, 2023
California AGCount not stated
TotalAug 28, 2023
ResearchCount not stated
Residents of WAAug 30, 2023
Washington AG581 people

Same campaign

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affectedHealthcareUSSep 22, 2023Cadence BankMOVEit zero-day used to steal Cadence Bank customer dataSupply chain14K affectedFinanceUSSep 15, 2023HoneywellMOVEit breach exposes pension plan participants' names and SSNsSupply chainManufacturingUSSep 13, 2023Pôle emploiProvider breach exposes names and social security numbers of French job seekersVendor breachGovernmentFRUnverifiedAug 25, 2023Colorado Department of Health Care Policy & FinancingIBM MOVEit breach exposes health data of 4.1 million Colorado Medicaid membersVendor breach4.1M affectedGovernmentUSAug 11, 2023TD AmeritradeMOVEit Transfer breach exposes TD Ameritrade client SSNs and account dataSupply chainFinanceUSAug 8, 2023Missouri Department of Social ServicesIBM MOVEit breach exposes Missouri Medicaid participants' dataVendor breach740K affectedGovernmentUSAug 7, 2023Radius Global SolutionsCollections firm Radius hit by MOVEit breach exposing consumer dataSupply chain632K affectedFinanceUSAug 4, 2023Garrett MotionMOVEit exploitation exposes Garrett Motion company, employee and customer dataSupply chainManufacturingCHAug 2, 2023SercoBenefits vendor CBIZ MOVEit breach exposes Serco US staff dataVendor breach10K affectedGovernmentUSAug 1, 2023Prudential FinancialPBI MOVEit breach exposes Prudential retirement payment recipientsVendor breachInsuranceUSJul 31, 2023Performance Health TechnologyMOVEit breach at health plan vendor exposes 1.7 million Oregon Health Plan membersSupply chain1.8M affectedHealthcareUSJul 31, 2023MaximusMOVEit breach exposes personal and health data of 8 to 11 million peopleSupply chain9.2M affectedGovernmentUSJul 26, 2023Pacific Premier BankTax compliance vendor's MOVEit breach exposes bank client dataVendor breachFinanceUSJul 25, 2023Johns Hopkins University and Health SystemMOVEit server breach at Johns Hopkins exposes personal informationSupply chainEducationUSJul 25, 2023Delta Dental of CaliforniaMOVEit breach exposes financial and card data of 6.9 million dental membersSupply chain7.1M affectedInsuranceUSJul 12, 2023Colorado State UniversityVendor MOVEit breaches expose Colorado State University student and staff dataVendor breachEducationUSJul 12, 2023Deutsche BankAccount switching provider breach exposes Deutsche Bank customer dataVendor breachFinanceDEUnverifiedJul 11, 20231st Source BankUnauthorized party accessed 1st Source Bank's MOVEit serverSupply chain450K affectedFinanceUSJul 10, 2023ShellSupply chain exposed names and employment records.Supply chainEnergyGBUnverifiedJul 6, 2023PlainsCapital BankCore banking vendor's MOVEit breach exposes nearly all PlainsCapital customersVendor breachFinanceUSJul 3, 2023TIAAVendor PBI MOVEit breach exposes TIAA participant dataVendor breachFinanceUSJun 30, 2023F&G Annuities & LifeVendor PBI MOVEit breach exposes data of many F&G policyholdersVendor breachInsuranceUSJun 30, 2023UCLASupply chain, data exposed not stated.Supply chainEducationUSUnverifiedJun 29, 2023Siemens EnergySupply chain, data exposed not stated.Supply 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 CareSource

Insider breachInsider exposed names and health records. Reported to the California AG.959 affectedInsuranceUSMay 6, 2022Insider breachInsider exposed names and health records. Reported to the HHS archive.8,730 affectedHealthcareUSNov 11, 2020
History of this record
records_basis2026-09-25
empty to hhsby backfillSource
records2026-09-25
empty to 3180537by backfillSource
disclosed2026-09-25
2023-08-28 to 2023-07-27by backfillSource
campaign2026-09-25
empty to moveit-2023by seedSource
attack2026-09-25
hacking to supply-chainby seedSource
data_types2026-09-25
[] to ["names","addresses","dob","ssn","health","insurance"]by seedSource
summary2026-09-25
empty to Managed care insurer CareSource said MOVEit software it used to manage member benefits was hacked on May 31, 2023, and data including Social Security numbers, member IDs, diagnoses and medications was copied.by seedSource
title2026-09-25
empty to MOVEit hack exposes CareSource members' health and personal databy seedSource
sector2026-09-25
other to healthby backfillSource
attack2026-09-25
unknown to hackingby backfillSource
discovered2026-09-25
empty to 2023-06-27by backfillSource
Added2026-09-25
First recordedby backfillSource

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

Everything about CareSource