Every public data breach

Disclosed this week47On record26,367

47 disclosed this week · 26,367 on record

Southern Illinois University

Disclosed Aug 20, 202644,118 affectedConfirmed

Official notice

What is known

People affected44,118 (as reported by the organization)
DisclosedAug 20, 2026
DiscoveredSep 29, 2025
HappenedSep 29, 2025
AttackHacking
Data exposedSocial Security numbersAddressesNames
SectorEducation · US
StatusConfirmed

Sources

Official noticeoag.ca.gov
California Attorney General breach notice: Southern Illinois University
Official noticeatg.wa.gov
Washington Attorney General breach notice: Southern Illinois University
Official noticeoag.my.site.com
Texas Attorney General data security breach report BR-0005277: Southern Illinois University
Official noticeago.vermont.gov
Vermont Attorney General breach report: Southern Illinois University

Notices filed

Residents of CAAug 20
California AGCount not stated
Residents of WAAug 20
Washington AG552 people
Residents of VTAug 20
Vermont AG23 people
Residents of TXAug 21
Texas AG1,597 people

Other breaches at Southern Illinois University

Breach, details not statedBreach notice filed with the Indiana AG, details not stated.38K affectedEducationUSOct 24, 2023
History of this record
source2026-09-25
empty to https://ago.vermont.gov/categories/security-breach-noticesby backfillSource
data_types2026-09-25
[] to ["ssn","addresses","names"]by backfillSource
records_basis2026-09-25
empty to organizationby backfillSource
records2026-09-25
empty to 44118by backfillSource
attack2026-09-25
unknown to hackingby backfillSource
discovered2026-09-25
empty to 2025-09-29by 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 Southern Illinois University