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MonitoringCA AG filing · March 12, 2026

Kaiser Foundation Health Plan Data Breach Exposes Member Data

Kaiser Foundation Health Plan recently disclosed an unauthorized disclosure incident impacting approximately 13.4 million members. This breach exposed member names, IP addresses, and health-related web activity through online tracking technologies. Affected individuals should understand their rights and potential risks from this sensitive information exposure.

State
CA
Affected
13,400,000
Breach date
April 12, 2024
Reported
March 12, 2026

What may have been exposed

  • member names
  • IP addresses
  • health-related web activity

Kaiser Foundation Health Plan has reported an unauthorized disclosure of its members' personal information, affecting an estimated 13.4 million individuals. The incident, identified on April 12, 2024, involved online tracking technologies that transmitted member data to various third-party vendors without proper authorization.

Specifically, the data exposed includes member names, IP addresses, and health-related web activity. This means that information about members' interactions with Kaiser's online services, related to their health interests, was shared with outside parties.

While direct medical records were not part of this disclosure, the exposure of health-related web activity, combined with member names and IP addresses, is still highly sensitive. This information could be used for targeted marketing, profiling, or other unsolicited communications that individuals may wish to avoid.

If you received a notification from Kaiser Foundation Health Plan regarding this data breach, it is crucial to review it carefully. We recommend you remain vigilant for any unusual or unsolicited communications, especially those related to health services or products. Additionally, consider reviewing and adjusting your privacy settings on web browsers and devices to limit online tracking.

This situation is currently under monitoring by the California Attorney General's office. If your personal information was compromised in this unauthorized disclosure, you may have legal avenues to pursue accountability and potential compensation. Our dedicated legal team offers free, no-obligation case reviews to help you understand your rights and determine if you qualify for representation.

We represent data breach victims on a contingency basis, meaning there are no upfront costs to you; we only get paid if we achieve a recovery on your behalf. Contact us today for a confidential discussion about how the Kaiser Foundation Health Plan data breach might affect you. This content is attorney advertising and does not establish an attorney-client relationship.

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