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Southern Illinois University: data breach filings, state by state

Southern Illinois University has 5 data breach filings on record in 5 government portals. The latest was reported to Massachusetts OCABR on Aug 21, 2026, with 134 Massachusetts residents. Data exposed, as filed: Social Security number, Postal address, Tax ID / EIN / ITIN, Phone number.

2,306residents counted in 4 states (MA, TX, VT, WA). Latest filing per state, last twelve months
44,118people in total, as reported to Texas AG on Aug 21, 2026
5filings in 5 government portals
Aug 21, 2026latest filing, Massachusetts OCABR

By portal

PortalFilingsLatest reportPeople in the latest filing
Massachusetts OCABR1Aug 21, 2026134 Massachusetts residents
Texas AG1Aug 21, 20261,597 Texas residents
Vermont AG1Aug 20, 202623 Vermont residents
California AG1Aug 20, 2026Not published
Washington AG1Aug 20, 2026552 Washington residents

Counts are the organization's own, as filed with each agency. Most state portals count their own residents only, so no single state shows the whole incident. An organization can file more than once for the same incident, and for different ones.

Case file

Breach window
Jul 10, 2025 to Sep 29, 2025
Discovered
No discovery date stated in the letters we read
Offered to those affected
No monitoring offer found in the letters we read
Third party named
No

Open the case fileWord document

Every filing with the agency links, each state's record against its statutory period with the citation, what the letter offers, prior incidents. Letter facts are quoted so you can check them.

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Every filing

OrganizationSourceStateReportedResidents affectedData exposed
Southern Illinois University Massachusetts OCABR MA Aug 21, 2026 134 Social Security number
Southern Illinois University Texas AG TX Aug 21, 2026 1,597 Social Security numberPostal addressName
Southern Illinois University Vermont AG VT Aug 20, 2026 23 Social Security number
Southern Illinois University California AG CA Aug 20, 2026 Not published Tax ID / EIN / ITINPhone numberPostal addressName
Southern Illinois University Washington AG WA Aug 20, 2026 552 Social Security numberName

Data reproduced from public government filings. Each row opens the record with the agency link. Spot an error? Email support@breachtally.com with the page link. Corrections are applied and noted.