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Breaches.

Delta Dental of California

Disclosed Jul 12, 20233 years ago7,056,189 affectedConfirmed

Official notice

MOVEit breach exposes financial and card data of 6.9 million dental members

Delta Dental of California and affiliates said attackers accessed and took data through the MOVEit Transfer flaw between May 27 and May 30, 2023. Its investigation, completed November 27, found 6,928,932 people had names and financial account or payment card numbers exposed.

What is known

People affected7,056,189 (as reported to HHS)
DisclosedJul 12, 2023
DiscoveredJun 1, 2023
HappenedMay 27, 2023
AttackSupply chain
Data exposedNames, Financial, Payment cards, Health
SectorInsurance · US
StatusConfirmed
Part ofMoveit (2023)

Sources

Source
Washington Attorney General breach notice: Delta Dental of Californiaatg.wa.gov · Official notice
Notice letter filed with the Delaware DOJ: Delta Dental of Californiaattorneygeneral.delaware.gov · Official notice
Oregon DOJ breach notice: Delta Dental of Californiajustice.oregon.gov · Official notice
California AG breach notice: Delta Dental of California and affiliatesoag.ca.gov · Regulator
Delta Dental of California data breach exposed info of 7 million peoplebleepingcomputer.com · News
HHS OCR breach report (archive, resolved): Delta Dental of California (Health Plan, CA)ocrportal.hhs.gov · Official notice

Notices filed

WhereFiledPeople
Delaware DOJresidents of DEJul 12, 202324,328
HHS archivetotalSep 5, 20237,056,189
Washington AGresidents of WADec 14, 2023106,098
Oregon DOJresidents of ORDec 14, 2023
ResearchtotalDec 14, 20236,928,932

Same campaign

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Deutsche BankAccount switching provider breach exposes Deutsche Bank customer dataJul 11, 20233 years agoVendor breachUnverifiedUnknown
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Wilton ReassuranceVendor PBI MOVEit breach exposes 1.48 million insurance customersJun 22, 20233 years agoVendor breach1.5M
Umpqua BankVendor and on-premise MOVEit breaches expose Umpqua customers' SSNsJun 22, 20233 years agoVendor breach429K
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Other breaches at Delta Dental of California

BreachAffected
Disclosed Jan 19, 2012Jan 19, 201214 years ago12K
History of this record
  • 2026-09-25 · data_types: ["names","financial","payment-card"] to ["names","financial","payment-card","health"] · backfill source
  • 2026-09-25 · records_basis: organization to hhs · backfill source
  • 2026-09-25 · records: 6928932 to 7056189 · backfill source
  • 2026-09-25 · campaign: empty to moveit-2023 · seed source
  • 2026-09-25 · sector: health to insurance · seed source
  • 2026-09-25 · attack: hacking to supply-chain · seed source
  • 2026-09-25 · data_types: ["names"] to ["names","financial","payment-card"] · seed source
  • 2026-09-25 · records_basis: empty to organization · seed source
  • 2026-09-25 · records: empty to 6928932 · seed source
  • 2026-09-25 · summary: empty to Delta Dental of California and affiliates said attackers accessed and took data through the MOVEit Transfer flaw between May 27 and May 30, 2023. Its investigation, completed November 27, found 6,928,932 people had names and financial accou · seed source
  • 2026-09-25 · title: empty to MOVEit breach exposes financial and card data of 6.9 million dental members · seed source
  • 2026-09-25 · data_types: [] to ["names"] · backfill source
  • 2026-09-25 · disclosed: 2023-12-14 to 2023-07-12 · backfill source
  • 2026-09-25 · added · backfill source

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

Everything about Delta Dental of California

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