The biggest data breaches in 2024: 1 billion stolen records and rising

This report reviews several of the largest 2024 cyber incidents — including AT&T’s multi-tens-of-millions record leaks, Change Healthcare’s ransomware-driven theft affecting a substantial portion of U.S. patient records, Synnovis’s disruptive ransomware attack on UK pathology services, and a widespread Snowflake credential-based data exfiltration impacting many corporate customers (e.g., Ticketmaster) — describing methods (stolen credentials, missing MFA), scale (tens to hundreds of millions of records, and in one case multi-billion broker data), and operational and privacy impacts across sectors.