McKesson Corporation
shinyhuntersThis record tracks a ransomware attack claimed by the shinyhunters group against McKesson Corporation. It collects the publicly disclosed attack details — sector, location and timeline — as published on the operator's leak site and indexed by Breach House.
Window Zero
EXPOSURE GAPWindow Zero is the time the breach stayed in the open before anyone said so — the gap between when the attack was first discovered on the operator's leak site (t1) and when it was publicly disclosed (t2). The wider this window, the longer victims, staff and customers were exposed with no warning.
Attack Summary
Hundreds of millions of records/rows of data was compromised containing very sensitive information spanning from PII to PHI. We urge you to reach out. Read our emails. We will provide a substanial discount. Failure to engage with us will result in the full publication of data taken from you and we very much intend to carry that out if you do not engage with us. This is a final warning to reach out by 1 Sep 2026 before we leak along with several annoying (digital) problems that'll come your way. Make the right decision, don't be the next headline. | Updated: 29 Aug 2026 | Warning: FINAL WARNING
Leak Screenshots
SAMPLEProof-of-breach screenshots the operator posted from the stolen data. Previews are redacted and locked — the originals are available on HaveIBeenRansom.