Last week, Uber acknowledged that more than a year ago, it paid hackers a US$100,000 (NZ$145,050) ransom to destroy personal data they stole concerning more than 57 million of its customers and drivers.
"Uber users who notice anything suspicious can contact Uber's Help Centre by tapping "Help" in the app, then "Account and Payment Options" "I have an unknown charge" "I think my account has been hacked".
Ferguson said that the ride-sharing company violated state law by not informing consumers that their information had been stolen in the 2015 breach.
The stolen information includes names, email addresses and phone numbers and - for USA drivers - licence numbers.
A spokesman for Uber told the BBC the firm is not able to clarify how many United Kingdom drivers are included in the 2.7 million.
IL is suing Uber over a year-old data breach that affected millions of users and drivers, NBC Chicago reported. "There is no excuse for keeping this information from consumers".
Mayor of London Sadiq Khan said in a statement: "This latest shocking development about Uber will alarm millions of Londoners whose personal data could have been stolen by criminals".
"While Uber has repeatedly asserted that there has been no evidence of fraud or misuse tied to the incident, the concealment of a data breach bears serious consequences under the Data Privacy Act of 2012", according to Privacy Commissioner Raymund Liboro.
The complaint also noted that "Uber is aware of its responsibilities to provide notice of data security breaches", citing the fact that, in 2016, "the New York Attorney General fined Uber for failing to notify drivers and that office about a data breach that occurred in 2014".
The lawsuit seeks civil penalties in the millions of dollars.
For its part, Uber disclosed that two individuals outside the company inappropriately accessed user data stored on a third-party cloud-based service that it uses.
The lawsuit was filed Tuesday in King County Superior Court.
That revelation prompted a delay in a high-profile trial over whether Uber stole self-driving auto technology from Waymo, a Google spinoff.