Know the breach before it knows you.
A curated ledger of the defining data breaches of the modern era — searchable, sourced, and rendered at the scale they deserve.
The Magnitude Index
The Ledger
Trends & Insights
Incidents by year
Most-affected sectors
Vulnerability exploitation is now the leading initial access vector at 31% of breaches — overtaking stolen credentials for the first time in nineteen years of reporting.
Third-party involvement in breaches has doubled year over year. The supply chain remains the industry's most persistent blind spot.
Generative AI is powering conversational phishing and automated reconnaissance — while handing defenders new detection capabilities in the same motion.
The Field Kit
Check whether your email or passwords surfaced in known breaches. Fast, trusted, free.
CHECK EXPOSURE →Searchable chronology of 75,000+ US breach notifications dating back to 2005.
EXPLORE DATABASE →The gold-standard annual analysis of 22,000+ real-world incidents.
READ THE REPORT →Official US alerts, known exploited vulnerabilities, and response guidance.
VISIT CISA →