Major Cyber Attacks in Review: December 2023

December 2023 featured a series of high-impact cyber incidents — multiple ransomware attacks (ALPHV/BlackCat, Cl0p) and supply-chain compromises, large-scale data breaches exposing millions of records (e.g., Mr.Cooper ~14.7M, Delta Dental ~6.9M, ESO ~2.7M, LoanCare ~1.3M), exploitation of the CitrixBleed vulnerability, and mass carding dumps (BidenCash ~1.9M cards), with effects spanning finance, healthcare, telecoms and critical infrastructure.