Novocure says attackers entered through a subsidiary and reached patient IDs
Novocure disclosed in a September 1, 2026 SEC filing that attackers accessed some of its information systems in mid-August after entering through a subsidiary. Internal ID numbers for more than 1,400 US patients were exposed, along with identifying information for fewer than 50 patients in the western United States. The company filed under Item 8.01, says no medical treatment devices were reached, and reports all systems fully functional.