Ticketmaster has experienced a significant data breach, exposing millions of users' information. The breach, which occurred between April and May, was only recently disclosed to customers via email notifications. Hackers have reportedly worked with scalpers to break 'non-transferable' tickets, further complicating the situation for fans and brokers. The breach underscores the critical need for enhanced cybersecurity measures. Sp1d3Hunters, a hacker group, has claimed responsibility and has released additional leaks. The incident has raised concerns about Ticketmaster's previous investments in security measures, which some believe were insufficient to prevent such breaches.