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Marathon Health
United States1 source
Confirmed:Confirmed by the organisation, a regulator or a securities filing. First reported 8 Nov 2026.
Marathon Health says 5.7 million patients' data stolen
Marathon Health stated that 5.7 million patients had personal and medical data stolen in an August breach carried out through social engineering. The company has been notifying affected individuals.
- Type
- Data breach
- Sector
- Healthcare
- Records
- 5.7M records confirmed
- First reported
- 8 Nov 2026
- Latest source
- 8 Nov 2026
What to do
- If you have an account, change that password, and anywhere you reused it.
- Turn on two-factor authentication, ideally an authenticator app or passkey, not SMS.
- Expect phishing that uses your real details. Do not click links in messages about this incident; go to the company's site directly.
- If payment cards were involved, watch statements and ask your bank for a new card.
- If government ID or social security numbers were involved, consider a credit freeze.
- If this is a vendor of yours, ask what of your data they held and whether it was in scope.
- Reset any API keys, SSO trusts or shared credentials you have with them.
- Brief your help desk: attackers often impersonate the breached brand next.
Not sure? Ask an assistant with the sources attached, or have a coding agent check your systems.
Check your systems for Marathon Health
Sources
1Confidence 55% that this is real and correctly placed. Locations are city centroids at best. Spotted an error? Report a correction.