People search McKesson data breach timeline because the brand sits on billions of accounts, credentials, and cloud workloads. BreachHistory indexes 1 McKesson-linked incident, with headline counts up to 11K+ in catalog rows. This page maps every attested event through 2026 with internal links to canonical records.
Why McKesson breach history matters
McKesson operates in Technology. Across indexed rows, recurring themes include mixed intrusion and disclosure events. Understanding the chronological pattern helps security teams, customers, and regulators separate confirmed disclosures from forum marketing.
Full timeline through 2026
2014 — patient RCM data reachable via Google dorking; >10k individuals (Dec–Apr)
Cataloged incident. PST Services, then described in trade press as a McKesson revenue-cycle subsidiary servicing physician groups, misconfigured an Internet-facing archive such that PHI—including names, insurance cards, diagnosis codes, billing details, and selective SSNs—became retrievable with search-engine queries between December 1, 2013 and April 17, 2014. Becker’s Hospital Review cataloged >10,000 affected patients across anchor practices like 24 On Physicians and Midwest Orthopaedic Center. DataBreaches.net reproduced the timel Exposed categories include HIPAA-regulated billing and clinical-administrative composites. BreachHistory cites approximately 11K+ affected records in this row. See the mckesson2014 and canonical BreachHistory entry.
Patterns and analysis
- Mixed intrusion and disclosure events — appears across multiple McKesson catalog entries; prioritize controls that address this class of failure.
- Record-count hygiene — BreachHistory indexes actor-cited figures separately from company-confirmed totals; read each row's technicalWriteup before treating counts as fact.
- 2026 monitoring — New disclosures roll into this timeline as they are verified or labeled unverified per catalog policy.
What to do if you may be affected
- Step 1: Enable phishing-resistant MFA on every account tied to this brand.
- Step 2: Use unique passwords and a password manager—breach rows often involve credential reuse.
- Step 3: Monitor official company breach notices and regulator filings, not dark-web downloads.
- Step 4: Review OAuth app permissions and revoke unused third-party integrations.
- Step 5: Bookmark the McKesson company page for new 2026+ disclosures.
Canonical BreachHistory hub
Explore every indexed row: breachhistory.com/mckesson · Latest: mckesson2014.
Sources: BreachHistory catalog (1 row for McKesson), company and regulator disclosures cited in individual breach records.