McKesson data breach
In August 2026, healthcare and pharmaceutical company McKesson was targeted in a ShinyHunters "pay or leak" extortion campaign. The group subsequently published a substantial corpus of data they alleged was sourced from the company, which included 6.4M unique email addresses among other personal and corporate data attributes. The impacted data related to a range of individuals and roles, including marketing campaign recipients, patients, staff and healthcare provider contacts. In McKesson's disclosure notice, the company advised it had identified unauthorised access to "certain third-party applications and the exfiltration of certain data was associated with a subset of customers within our Oncology & Multispecialty and Medical-Surgical business units", but had "reasonable assurance of no ongoing unauthorized activity".
Sources
- Primary: https://www.mckesson.com/utility/cybersecurity/customer-cybersecurity-information-center/
- Upstream record (Have I Been Pwned): https://haveibeenpwned.com/Breach/McKesson
- Breach data from Have I Been Pwned (haveibeenpwned.com), CC BY 4.0
Defenses for this class of incident
all categoriesA data breach sits in these classes of the AI-security landscape. The companies below work on that class of problem. This is a taxonomy, not a claim that any of them would have changed this incident.
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