A class action lawsuit has been launched against health insurance provider Medibank in the Federal Court over last year’s massive cyberattack. In what became the worst data breach in Australia’s corporate history, the personal data of 9.7 million current and former customers of Medibank and its low-cost brand ahm were compromised. The lawsuit on behalf of tens of thousands of affected customers is seeking up to $5 billion in compensation for Medibank’s alleged failure to protect customer’s privacy – the company says it will defend the proceedings. A decision on whether a separate class action lawsuit that’s being arranged by law firm Slater & Gordon is expected to be made in the next few months. And speaking of notable hacks, Telstra reported their half-year profit result yesterday and noted that it had picked up tens of thousands of new customers who quit Optus in the wake of its data breach.