McKesson Breach: How the Okta Vishing Attack Happened

By Editorial Team | September 2, 2026
An Okta vishing attack gave ShinyHunters access to McKesson's Salesforce and Snowflake data, followed by a $55 million ransom demand.

An Okta vishing attack — a phone call, not a piece of malware — is how the extortion group ShinyHunters claims it broke into US healthcare and pharmaceutical distribution giant McKesson. McKesson has confirmed unauthorized access to third-party applications and data exfiltration, but has not confirmed the attack path itself: according to ShinyHunters’ own account,…

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