Leaks, data breaches, and ransom notes: The worst hacks of 2026 so far

A 2026-themed cybersecurity roundup documenting numerous severe incidents: alleged exfiltration of Social Security records, widespread supply-chain compromises affecting open-source tools and Big Tech, mass identity-document leaks from IDScan, major healthcare and corporate breaches (Klue, DentaQuest, CareCloud, Aesto), destructive nation-state attacks on medical device makers and critical infrastructure (water and energy), and breaches of U.S. law-enforcement systems (FBI, ATF); the report highlights large scale, cross-sector impact, ongoing investigations, and extortion/ransom activity.