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breaches incidents
ShinyHunters claims it stole 284 million patient records from McKesson
ShinyHunters claims to have stolen 284 million patient records from McKesson, a major U.S. healthcare distributor, through unauthorized access to third-party applications. The company detected the intrusion on August 25, 2026, and stated the investigation is ongoing with materiality not yet determined.
Why it matters: Healthcare organizations, insurers, and patients need to assess whether their data is in the compromised dataset and prepare breach notification protocols; McKesson customers should assume supply chain exposure and verify third-party access controls.
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- First seen by Cybersecurity Tracker