The reported breach could involve as many as 560 million customer records.

The company blamed a "bot attack" for crippling ticket sales for the Swift tour as it defends accusations of anti-competitive behavior.

A former employee at the rival company had leaked logins to Ticketmaster, according to the Department of Justice.

Bad bots made up 39.9 percent of ticket-buying traffic between September and December 2018, according to Distil Networks.

With the body of forensic evidence tied to Magecart growing, researchers have released recommendations for defending against the group.

A RiskIQ researcher says targeting third-party web apps is the "supply chain attack for the web."

Ticketmaster says a chat app by Inbenta Technologies was the problem. But Inbenta claims Ticketmaster improperly deployed the app on its payment system.