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BreachesSep 1, 2026

Novocure data breach affects more than 1,400 cancer patients

Novocure data breach exposes records of over 1,400 cancer patients and employees.

Healthtech company Novocure has disclosed a cyberattack that exposed the data of over 1,400 U.S. cancer patients and an undisclosed number of employees. The incident, discovered in mid-August, involved unauthorized access to information systems, leading to the exposure of patient ID numbers and, for a smaller subset, identifying and contact information for healthcare providers. Employee contact details were also compromised.

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The lesson from this incident

Full lesson

Novocure suffered a cyberattack resulting in unauthorized access to systems containing sensitive health and contact information for over 1,400 cancer patients and an undisclosed number of employees. The breach highlights the critical risk of inadequate access controls and insufficient monitoring in healthcare environments where patient data is highly sensitive and heavily regulated. Delayed discovery — with the incident found in mid-August but likely occurring earlier — suggests gaps in real-time detection and logging capabilities. Healthcare organizations handling Protected Health Information (PHI) face severe consequences under HIPAA when access controls and monitoring fail to prevent or promptly detect intrusions.

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Novocure (vendor)ShinyHunters (threat_actor)Tumor Treating Fields (product)McKesson (vendor)Nutex (vendor)CareCloud (vendor)