Forrester analyzed the top global breaches and worst privacy abuses of 2025 and identified key trends and lessons learned. With more than 10.6 billion records exposed in the top 35 breaches alone and almost $2.8 billion in fines levied on the top violators, lessons abound for security teams. Security and privacy leaders should use this report to understand the key breaches and lessons from the past year and augment their security and privacy strategies accordingly.