ShinyHunters claims McKesson data breach exposing 284 million patient records

Reports

4

Domains carrying it

4

First reported

28 August 2026

Latest report

31 August 2026

◆ Sectors

◆ Where

United States

◆ Timeline

1. 28 August 2026ShinyHunters claims McKesson data breach exposing 284 million patient recordscyberinsider.com
2. 29 August 2026McKesson Breach: ShinyHunters Claims 284m Patient Recordscybernews.com
3. 31 August 2026ShinyHunters claims it stole 284 million patient records from McKessonhelpnetsecurity.com
4. 31 August 2026McKesson confirms cybersecurity incident as hackers claim millions of patient records stolenfiercehealthcare.com

◆ Connected developments

Situations Wire finds semantically close to this one. Proximity, not cause.

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• Hacking group claims mass data theft from Shell, Philips, GE, Fiserv and dozens of others2 reports · 2 domains · 13 August 2026
• ATF investigates 'major' cybersecurity incident as ransomware group claims attack5 reports · 5 domains · 29 August 2026
• Apollo discloses data breach from ongoing wave of attacks hitting financial sector3 reports · 3 domains · 24 August 2026

◆ Share

◆ Evidence

4 reports · 4 domains

• McKesson confirms cybersecurity incident as hackers claim millions of patient records stolenfiercehealthcare.com · 31 August 2026
• ShinyHunters claims it stole 284 million patient records from McKessonhelpnetsecurity.com · 31 August 2026
• McKesson Breach: ShinyHunters Claims 284m Patient Recordscybernews.com · 29 August 2026
• ShinyHunters claims McKesson data breach exposing 284 million patient recordscyberinsider.com · 28 August 2026