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Blue Shield of California data breach leaked millions of users’ health data to Google

  • Blue Shield of California notified 4.7 million people about protected health information shared with Google from April 2021 to January 2024.
  • A misconfiguration allowed Google Analytics to share member data with Google Ads.
  • Shared data included patient names, insurance plan details, and provider search terms.
  • Blue Shield stated, "no bad actor was involved," in the incident.
  • This ranks as the largest healthcare data breach reported in 2025.
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BleepingComputer broke the news in on Wednesday, April 23, 2025.
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