A year in review: 10 of the biggest security incidents of 2023

This article reviews the ten biggest cybersecurity incidents of 2023, covering massive data breaches (e.g., MOVEit affecting tens of millions, DarkBeam exposing 3.8 billion records, ICMR ~815 million records), high-impact ransomware operations tied to Clop and ALPHV/BlackCat affiliates, a critical HTTP/2 zero-day that enabled record-setting DDoS traffic, insider leaks (Pentagon), and common attack methods like zero-day exploitation, misconfiguration, credential stuffing, and social engineering—illustrating widespread, high-severity threats across public- and private-sector targets.