Every public data breach

Disclosed this week47On record26,367

47 disclosed this week · 26,367 on record

Wisconsin Historical Society

Disclosed Jan 17, 20202,206 affectedConfirmed

Official notice

What is known

People affected2,206 (as reported by the organization)
DisclosedJan 17, 2020
HappenedJun 8, 2019
AttackNot stated
Data exposedNames
SectorNonprofit · US
StatusConfirmed

Sources

Official noticein.gov
Indiana Attorney General 2020 data breach report: Wisconsin Historical Society
Official noticemaine.gov
Maine Attorney General breach notice archive: Wisconsin Historical Society

Notices filed

Residents of MEJan 17, 2020
Maine AG1 person
Residents of INJan 21, 2020
Indiana AG19 people
History of this record
data_types2026-09-25
[] to ["names"]by backfillSource
disclosed2026-09-25
2020-01-21 to 2020-01-17by backfillSource
Added2026-09-25
First recordedby backfillSource

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

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