Confirmed breach

Horizon Media data breach

USUnited States

Horizon Media (United States) notified the Vermont Attorney General, the Indiana Attorney General and the California Attorney General of a data breach on 6 May 2026. It told the states about 15 Indiana residents; the total can be higher. Exposed: Social Security numbers, Government ID numbers and Health and medical information.

Status: Confirmed breach
People affected: 15 Indiana residents (one state’s count; the total can be higher)
Reported: 6 May 2026
Across the state notices: at least 25 people (Vermont and Indiana: each state counts only its own residents)

What was exposed

Social Security numbers
Government ID numbers
Health and medical information

Before the notice: the ransomware gang Chaos named Horizon Media on its leak site on 9 February 2026, 86 days before this was reported. Matched by the organisation’s name: the notice itself does not say who the attacker was.

What changed since it was first reported

29 October 2026 Confirmed breach, 15 Indiana residents (Indiana Attorney General)

What the letter says

We have not read this letter yet.

Got a letter or email about this breach? Check it is real →

Read the letter (PDF), as filed with the California Attorney General.

Sources

Official notices are read by code from the regulator’s own register. More notices to Vermont, Indiana, California. · Corrections and changes

If Horizon Media had your data

Look for Horizon Media’s own notice or letter: it should say what of yours was involved. Keep it.
An ID number cannot be changed, so lock it: a credit freeze or fraud alert in the US, a credit warning (kreditadvarsel) on borger.dk in Denmark, Cifas protective registration in the UK.
Check your health insurer’s statements for treatment you never had.
Expect scams that use your details: calls, texts or emails pretending to be Horizon Media, your bank or the police. Never give codes or passwords, never approve a sign-in you did not start, never move money.

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From the data breach tracker: official notices, breach databases and the news, every fact with its source. Open data (CC BY 4.0) · How the tracker works · Official registers · Corrections and changes · Found a mistake? Tell us and we correct it.