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Confirmed breach

Marin Cancer Care data breach

USUnited States

Marin Cancer Care (United States) notified the Vermont Attorney General and the California Attorney General of a data breach on 23 April 2026. It told the states about 2 Vermont residents; the total can be higher. Exposed: Health and medical information.

Status
Confirmed breach
People affected
2 Vermont residents (one state’s count; the total can be higher)
Reported
23 April 2026

What was exposed

  • Health and medical information

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, California. · Corrections and changes

If Marin Cancer Care had your data

  1. Look for Marin Cancer Care’s own notice or letter: it should say what of yours was involved. Keep it.
  2. Check your health insurer’s statements for treatment you never had.
  3. Expect scams that use your details: calls, texts or emails pretending to be Marin Cancer Care, your bank or the police. Never give codes or passwords, never approve a sign-in you did not start, never move money.

One email to confirm first. We use your address only for this alert, and one click deletes it.

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Every breach in United States →

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.