Nationstar Mortgage

Disclosed Dec 15, 20232 years agoConfirmed

Official notice

What is known

People affected	Not stated in the sources we have
Disclosed	Dec 15, 2023
Discovered	Oct 31, 2023
Happened	Oct 30, 2023
Attack	Ransomware
Data exposed	Names
Sector	Finance · US
Status	Confirmed

Sources

Source	Kind
California Attorney General breach notice: Nationstar Mortgageoag.ca.gov · Official notice	Official notice
Washington Attorney General breach notice: Nationstar Mortgageatg.wa.gov · Official notice	Official notice
Notice letter filed with the Delaware DOJ: Nationstar Mortgageattorneygeneral.delaware.gov · Official notice	Official notice
Oregon DOJ breach notice: Nationstar Mortgagejustice.oregon.gov · Official notice	Official notice

Notices filed

Where	Filed	People
California AGresidents of CA	Dec 15, 2023
Washington AGresidents of WA	Dec 15, 2023	408,616
Delaware DOJresidents of DE	Dec 15, 2023	54,789
Oregon DOJresidents of OR	Dec 15, 2023	14,690,284
California AGresidents of CA	Mar 22, 2024

Other breaches at Nationstar Mortgage

Breach	Disclosed	Attack	Sector	Status	Affected
Disclosed Mar 19, 2021Mar 19, 20215 years ago	Mar 19, 20215 years ago	Not stated	Finance	Confirmed	596
Disclosed Nov 9, 2016Nov 9, 20169 years ago	Nov 9, 20169 years ago	Not stated	Finance	Confirmed	32
Disclosed Aug 12, 2015Aug 12, 201511 years ago	Aug 12, 201511 years ago	Not stated	Finance	Confirmed	1,159

History of this record

2026-09-25 · data_types: [] to ["names"] · backfill source
2026-09-25 · attack: unknown to ransomware · backfill source
2026-09-25 · discovered: empty to 2023-10-31 · backfill source
2026-09-25 · disclosed: 2024-03-22 to 2023-12-15 · backfill source
2026-09-25 · added · backfill source

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

Everything about Nationstar Mortgage

New breaches by email

Wednesdays, only in weeks with newly disclosed breaches, the largest first.