Every public data breach

Disclosed this week44On record26,355

44 disclosed this week · 26,355 on record

Flagstar Bank

Disclosed Oct 5, 2023837,390 affectedConfirmed

Official notice

Fiserv MOVEit breach exposes 837,390 Flagstar customers

Flagstar Bank said its payment processing vendor Fiserv was breached in the MOVEit attacks, exposing names and Social Security numbers of 837,390 US customers. It was Flagstar's third breach since 2021.

What is known

People affected837,390 (as reported by the organization)
DisclosedOct 5, 2023
DiscoveredAug 3, 2023
HappenedMay 27, 2023
AttackVendor breach
Data exposedNamesSocial Security numbers
SectorFinance · US
StatusConfirmed
Part ofMoveit (2023)

Sources

Official noticeoag.ca.gov
California Attorney General breach notice: Flagstar Bank
Official noticeatg.wa.gov
Washington Attorney General breach notice: Flagstar Bank
Official noticejustice.oregon.gov
Oregon DOJ breach notice: Flagstar Bank
Regulatoroag.ca.gov
California AG breach notice: Flagstar Bank, N.A.
Newsbleepingcomputer.com
Third Flagstar Bank data breach since 2021 affects 800,000 customers

Notices filed

Residents of CAOct 5, 2023
California AGCount not stated
Residents of WAOct 5, 2023
Washington AG2,412 people
TotalOct 5, 2023
Research837,390 people
Residents of OROct 6, 2023
Oregon DOJ837,390 people
Residents of CADec 15, 2023
California AGCount not stated

Same campaign

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History of this record
campaign2026-09-25
empty to moveit-2023by seedSource
attack2026-09-25
ransomware to third-partyby seedSource
data_types2026-09-25
[] to ["names","ssn"]by seedSource
records_basis2026-09-25
empty to organizationby seedSource
records2026-09-25
empty to 837390by seedSource
summary2026-09-25
empty to Flagstar Bank said its payment processing vendor Fiserv was breached in the MOVEit attacks, exposing names and Social Security numbers of 837,390 US customers. It was Flagstar's third breach since 2021.by seedSource
title2026-09-25
empty to Fiserv MOVEit breach exposes 837,390 Flagstar customersby seedSource
attack2026-09-25
unknown to ransomwareby backfillSource
discovered2026-09-25
empty to 2023-08-03by backfillSource
disclosed2026-09-25
2023-12-15 to 2023-10-05by 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 Flagstar Bank