Healthcare and pharmaceutical distribution giant McKesson on 2026-08-28 disclosed a cybersecurity incident involving unauthorized access and data theft, with the ShinyHunters extortion group claiming on 2026-08-30 to have exfiltrated 284 million healthcare records via vishing attacks on third-party applications. The breach represented one of the largest healthcare data exposures.
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McKesson disclosed a cybersecurity incident involving unauthorized access to third-party applications and data exfiltration after the ShinyHunters extortion group claimed it stole 284 million patient data records from the healthcare and pharmaceutical distribution company [bleepingcomputer.com#1][google.com#2]. A Reddit post discussing the claim said ShinyHunters alleged it voice-phished two McKes
Healthcare and pharmaceutical distribution giant McKesson has disclosed a cybersecurity incident involving unauthorized access to third-party applications and data theft, with the ShinyHunters extortion group claiming it stole 284 million patient data records. [...]
Healthcare and pharmaceutical distribution giant McKesson has disclosed a cybersecurity incident involving unauthorized access to third-party applications and data theft, with the ShinyHunters extortion group claiming it stole 284 million patient data records. https://www. bleepingcomputer.com/news/secu rity/mckesson-discloses-breach-after-shinyhunters-claims-patient-data-theft/
"McKesson discloses breach after ShinyHunters claims patient data theft" "" https://www. bleepingcomputer.com/news/secu rity/mckesson-discloses-breach-after-shinyhunters-claims-patient-data-theft/ # Cybersecurity
🤖 McKesson discloses breach: unauthorized access to third-party apps led to data theft. ShinyHunters claims 284M patient records exfiltrated — among the largest healthcare breaches claimed. Scope and impact assessment ongoing. 🔗 https://www. bleepingcomputer.com/news/secu rity/mckesson-discloses-breach-after-shinyhunters-claims-patient-data-theft/ # DataBreach # InfoSec # CyberSec
McKesson disclosed a # databreach involving unauthorized access to third-party applications and data theft. ShinyHunters claims it stole ~284M patient-related records, not necessarily unique patients, and demanded a $55.2M ransom. https://www. bleepingcomputer.com/news/secu rity/mckesson-discloses-breach-after-shinyhunters-claims-patient-data-theft/
🤖 McKesson discloses a breach after ShinyHunters claims it stole 284 million patient records via unauthorized access to third-party applications. Healthcare/pharma distribution giant investigating the incident. 🔗 https://www. bleepingcomputer.com/news/secu rity/mckesson-discloses-breach-after-shinyhunters-claims-patient-data-theft/ # DataBreach # InfoSec # CyberSec
McKesson confirmed a security breach after ShinyHunters claimed to have exfiltrated 284 million healthcare records. The attack leveraged vishing to compromise third-party applications. Discovery occurred August 25, 2026, with the investigation still in early stages. # McKessonBreach # VishingAttack # ShinyHunters # HealthcareData https:// cyberworldops.eu/en/mckesson-d iscloses-breach-shinyhunters