Every public data breach

Disclosed this week44On record26,355

44 disclosed this week · 26,355 on record

Delta Dental of California

Disclosed Jul 12, 20237,056,189 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 exposedNamesFinancialPayment cardsHealth
SectorInsurance · US
StatusConfirmed
Part ofMoveit (2023)

Sources

Official noticeatg.wa.gov
Washington Attorney General breach notice: Delta Dental of California
Official noticeattorneygeneral.delaware.gov
Notice letter filed with the Delaware DOJ: Delta Dental of California
Official noticejustice.oregon.gov
Oregon DOJ breach notice: Delta Dental of California
Regulatoroag.ca.gov
California AG breach notice: Delta Dental of California and affiliates
Newsbleepingcomputer.com
Delta Dental of California data breach exposed info of 7 million people
Official noticeocrportal.hhs.gov
HHS OCR breach report (archive, resolved): Delta Dental of California (Health Plan, CA)

Notices filed

Residents of DEJul 12, 2023
Delaware DOJ24,328 people
TotalSep 5, 2023
HHS archive7,056,189 people
Residents of WADec 14, 2023
Washington AG106,098 people
Residents of ORDec 14, 2023
Oregon DOJCount not stated
TotalDec 14, 2023
Research6,928,932 people

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Other breaches at Delta Dental of California

Breach, details not statedExposed names and health records. Reported to the HHS archive.12K affectedInsuranceUSJan 19, 2012
History of this record
data_types2026-09-25
["names","financial","payment-card"] to ["names","financial","payment-card","health"]by backfillSource
records_basis2026-09-25
organization to hhsby backfillSource
records2026-09-25
6928932 to 7056189by backfillSource
campaign2026-09-25
empty to moveit-2023by seedSource
sector2026-09-25
health to insuranceby seedSource
attack2026-09-25
hacking to supply-chainby seedSource
data_types2026-09-25
["names"] to ["names","financial","payment-card"]by seedSource
records_basis2026-09-25
empty to organizationby seedSource
records2026-09-25
empty to 6928932by seedSource
summary2026-09-25
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 accouby seedSource
title2026-09-25
empty to MOVEit breach exposes financial and card data of 6.9 million dental membersby seedSource
data_types2026-09-25
[] to ["names"]by backfillSource
disclosed2026-09-25
2023-12-14 to 2023-07-12by backfillSource
Added2026-09-25
First recordedby backfillSource

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