Data Breach WatchDBW

Healthcare

High

investigation open

Updated about 1 month ago

Marin Cancer Care Data Breach

▼ Key takeaways

•Reports suggest a potential breach involving Marin Cancer Care.
•Discovered on February 1, 2026.
•Affects individuals in: California.
•Confirmation level: Confirmed by regulators.

Breach confirmed

The Marin Cancer Care breach is confirmed. If you may be affected, add your details below and we will take it from there.

Detailed summary

Marin Cancer Care experienced a data breach that was discovered in February 2026. This incident was a hacking/IT incident. The breach was confirmed by reports from the HIPAA Journal and a class action investigation by FBFG.

This incident affected 501 individuals. The specific types of data exposed, whether SSN/medical/financial data were involved, have not been publicly confirmed. Official breach notification letter text and the company's official breach notification statement are also not available.

Details can continue to emerge as investigations proceed, and official notifications to consumers may be delayed.

Company Response Timeline

Breach Occurred

Feb 1, 2026

Company Discovered

Feb 1, 2026

Regulator Notified

Unknown

Consumers Notified

Unknown

0 days to discover

Breach Verification Status

Reports Only

Complete

Initial dark web reports of potential breach

Company Confirmed

Complete

Company has acknowledged the breach

Regulator Confirmed

Current

Confirmed by regulatory authorities

Note: Breach verification can take time. Information may evolve as more details become available from companies and regulators.

Case Status:

Investigation Open

We're actively investigating this case and seeking affected individuals.

Were you affected? Submit your information below.

Were You Affected By This Breach?

If you are a customer or have received a data breach notification, you may submit your information as part of our ongoing investigation. Submitting your information is free and does not obligate you.

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Check Your Risk Level

Answer a few questions to understand how this breach might affect you

Do you use Marin Cancer Care?

Yes

What state are you in?

What should I do?

Change your passwords

Update passwords for the affected service and any accounts using the same password

Enable two-factor authentication

Add an extra layer of security to your accounts

Monitor your accounts

Watch for suspicious activity on your financial and online accounts

Watch for phishing attempts

Be cautious of emails or messages claiming to be from the affected company

Consider a credit freeze

Prevent unauthorized access to your credit report

Scan your email for other exposures

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