Every public data breach

Disclosed this week44On record26,355

44 disclosed this week · 26,355 on record

Welltok

Disclosed Sep 22, 202314,782,887 affectedConfirmed

Official notice

MOVEit server breach exposes data of 8.5 million US patients

Healthcare SaaS provider Welltok said its MOVEit Transfer server was accessed and patient data for health plans and providers including several Blue Cross Blue Shield plans, Sutter Health and Corewell Health was taken. The HHS breach portal lists 8,493,379 affected people.

What is known

People affected14,782,887 (as reported to HHS)
DisclosedSep 22, 2023
DiscoveredAug 11, 2023
HappenedMay 30, 2023
AttackSupply chain
Data exposedNamesEmailsAddressesPhone numbersSocial Security numbersInsuranceHealth
SectorHealthcare · US
StatusConfirmed
Part ofMoveit (2023)

Sources

Official noticeoag.ca.gov
California Attorney General breach notice: Welltok
Official noticeattorneygeneral.delaware.gov
Notice letter filed with the Delaware DOJ: Welltok
Official noticejustice.oregon.gov
Oregon DOJ breach notice: Welltok
Regulatoroag.ca.gov
California AG breach notice: Welltok, Inc.
Newstechcrunch.com
Hackers accessed sensitive health data of Welltok patients
Newsbleepingcomputer.com
Welltok data breach exposes data of 8.5 million US patients
Official noticeocrportal.hhs.gov
HHS OCR breach report (archive, resolved): Welltok (Business Associate, CO)

Notices filed

Residents of DESep 22, 2023
Delaware DOJ10,708 people
TotalNov 6, 2023
HHS archive14,782,887 people
Residents of CANov 17, 2023
California AGCount not stated
TotalNov 17, 2023
Research8,493,379 people
Residents of ORNov 18, 2023
Oregon DOJ1,648,848 people
Residents of CANov 22, 2023
California AGCount not stated

Same campaign

AmazonVendor breach exposed names, emails, phone numbers and employment records.Vendor breachRetailUSUnverifiedNov 11, 2024AutoZoneMOVEit breach exposes data of 184,995 AutoZone customers and staffSupply chain185K affectedRetailUSNov 20, 2023State of MaineMOVEit breach exposes data of 1.3 million people across Maine agenciesSupply chain1.3M affectedGovernmentUSNov 10, 2023University of MissouriMOVEit breach exposes University of Missouri personal dataSupply chain119K affectedEducationUSOct 20, 2023Flagstar BankFiserv MOVEit breach exposes 837,390 Flagstar customersVendor breach837K affectedFinanceUSOct 5, 2023Sony Interactive EntertainmentMOVEit zero-day exposes data of 6,791 Sony employees and relativesSupply chain6,791 affectedGamingUSOct 3, 2023BORN OntarioMOVEit breach exposes perinatal and child registry data of 3.4 millionSupply chain3.4M affectedHealthcareCAUnverifiedSep 25, 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, 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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
History of this record
records_basis2026-09-25
organization to hhsby backfillSource
records2026-09-25
8493379 to 14782887by backfillSource
campaign2026-09-25
empty to moveit-2023by seedSource
sector2026-09-25
other to healthby seedSource
attack2026-09-25
unknown to supply-chainby seedSource
data_types2026-09-25
["names"] to ["names","emails","addresses","phone","ssn","insurance","health"]by seedSource
records_basis2026-09-25
empty to organizationby seedSource
records2026-09-25
empty to 8493379by seedSource
summary2026-09-25
empty to Healthcare SaaS provider Welltok said its MOVEit Transfer server was accessed and patient data for health plans and providers including several Blue Cross Blue Shield plans, Sutter Health and Corewell Health was taken. The HHS breach portalby seedSource
title2026-09-25
empty to MOVEit server breach exposes data of 8.5 million US patientsby seedSource
data_types2026-09-25
[] to ["names"]by backfillSource
disclosed2026-09-25
2023-11-17 to 2023-09-22by backfillSource
discovered2026-09-25
empty to 2023-08-11by backfillSource
disclosed2026-09-25
2023-11-22 to 2023-11-17by 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 Welltok