6.4M accounts from McKesson (mckesson.com) were exposed in this breach. Besides email addresses, it included dates of birth, employers and genders.
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Dates of birthEmail addressesEmployersGendersNamesPersonal health dataPhone numbersPhysical addresses
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".
Source: Have I Been Pwned (CC BY 4.0)