In today’s data-driven world, data breaches can affect hundreds of millions or even billions of people at a time. Digital transformation has increased the supply of data moving, and data breaches have scaled up with it as attackers exploit the data-dependencies of daily life. How large cyberattacks of the future might become remains speculation, but as this list of the biggest data breaches of the 21st Century indicates, they have already reached enormous magnitudes.
[ Learn the The 5 types of cyberattack you’re most likely to face. | Get the latest from CSO by signing up for our newsletters. ]
More Stories
Windscribe Acquitted on Charges of Not Collecting Users’ Data
The company doesn’t keep logs, so couldn’t turn over data: Windscribe, a globally used privacy-first VPN service, announced today that...
Uyghur Diaspora Group Targeted with Remote Surveillance Malware
Members of the World Uyghur Congress living in exile were targeted with a spear phishing campaign deploying surveillance malware, according...
Half of Mobile Devices Run Outdated Operating Systems
50% of mobile devices run outdated operating systems, increasing vulnerability to cyber-attacks, according to the latest report from Zimperium Read...
Researchers Note 16.7% Increase in Automated Scanning Activity
According to the 2025 Global Threat Landscape Report from FortiGuard, threat actors are executing 36,000 scans per second Read More
2025 Cyber Resilience Research Discovers Speed of AI Advancing Emerging Attack Types
New Global Data Helps Organizations Move to Cyber Resilience and Shatter Silos It is no secret that AI is advancing...
ISACA Highlights Critical Lack of Quantum Threat Mitigation Strategies
An ISACA survey found that just 5% of organizations have a defined strategy to defend against quantum-enabled threats Read More