NovoCure 2026 Data Breach
NovoCure Limited said in a September 1, 2026 filing with the U.S. Securities and Exchange Commission that it became aware of unauthorized access to certain information systems in mid-August.
This classification is based on a reviewed lower bound; the actual impact and severity may be higher.
Exposed Data Types
3 sensitive6- Internal patient ID numbers
- Additional identifying information for fewer than 50 U.S. patients
- General healthcare-provider contact information
- Employee job titles
- Employee phone numbers
- Email addresses
About This Breach
The company said it contained the incident after detection, opened an internal investigation, and engaged independent cybersecurity forensic specialists to assist its assessment. The public filing does not identify when the access began or ended; September 1 is the date NovoCure disclosed the matter publicly.
In NovoCure’s assessment, more than 1,400 U.S. patient records contained only its internal patient ID numbers. The company specifically said that this group of records did not include patient names or other identifying information. It separately reported additional identifying information involving fewer than 50 other patients in the western United States. The review also covered general contact information for healthcare providers, along with employee job titles and phone numbers.
NovoCure said no medical treatment devices were accessed and that its systems remained functional. Its filing does not describe the additional information associated with the smaller patient group, provide a final total of affected people or records, or state how many employees and providers were involved. The company’s forensic review remained ongoing on the filing date.
Verification and editorial method
LeakData compares the incident name, date, affected-record count, and exposed data types with accessible sources. Unverified fields are not presented as facts, and records are updated when new evidence becomes available.
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