Kaiser Permanente, a leading healthcare organization in the United States, has disclosed a data breach impacting approximately 13.4 million of its members and patients. The breach involved unintended transmission of personal information to third-party vendors, including major tech companies Google, Microsoft Bing, and X (formerly Twitter), via installed online technologies on Kaiser’s websites and mobile apps. Kaiser Permanente is renowned for its integrated healthcare services, offering both healthcare plans and medical services to millions across the country. It operates as a non-profit healthcare provider with a network that includes numerous hospitals and a comprehensive range of medical facilities. The data exposure was discovered following an internal investigation conducted voluntarily by Kaiser Permanente. The company discovered that online trackers used on its websites and mobile applications were transmitting certain types of personal data when users interacted with its services.