The Top Cyberattacks of April 2021

April 2021 saw a cluster of impactful cyber incidents: a ParkMobile third-party breach exposed personal data across multiple U.S. cities; a ransomware attack on the University of Hertfordshire forced class cancellations and service outages; the Babuk ransomware group breached the Washington, D.C. Metropolitan Police Department and threatened to publish sensitive law-enforcement data; and a Pennsylvania contact-tracing effort accidentally exposed ~72,000 individuals' health and personal information due to insecure third-party account usage — underscoring vendor risk, ransomware extortion, and the consequences of security shortcuts.