13.4M Kaiser Insurance Members Affected by Data Leak to Online Advertisers

Kaiser Permanente disclosed a privacy incident affecting about 13.4 million current and former insurance members after improperly implemented third‑party tracking code on its web and mobile properties transmitted personal information (names, IP addresses, visited pages, signed-in status and search terms) to advertising vendors such as Google, Microsoft, and X; the company removed the tracking code and characterized the event as an inadvertent exposure rather than a hacking incident.