GoKawiilMcKesson confirms data breach after ShinyHunters claims 284 million patient records stolen
McKesson, a major U.S. healthcare and pharmaceutical distributor, disclosed in an SEC filing that it discovered unauthorized access to third-party applications and data exfiltration on August 25, 2026. The extortion group ShinyHunters claims responsibility, alleging it stole 284 million patient records, though McKesson has not confirmed the scope or named the affected applications. The company says its investigation is ongoing and has not yet determined whether the incident is financially material.