Top 10 Breaches of the Week
Security Boulevard, Friday, October 9th, 2026
Security Boulevard's weekly breach roundup, led by an Oracle Health/Cerner incident that may affect nearly 20 million people.
Security Boulevard's weekly after-action report reviews the most important breaches across sectors including healthcare, public services, energy, finance, retail, education and technology, separating confirmed exposure from unresolved scope and attacker claims.
Topping the list is Oracle Health/Cerner, where attackers used stolen customer credentials to access two legacy Cerner servers not yet migrated to Oracle Cloud, and Texas filings suggest nearly 20 million people may be affected, though Oracle hasn't confirmed it.
The takeaway is to rotate credentials and isolate unmigrated systems during cloud migrations.