Police warn Uber passengers that they are at risk from unscreened drivers bypassing the rideshare operator's photo ID technology to work under other people's accounts.

The vulnerabilities of Uber's security was exposed when unauthorised Uber driver Manpreet Singh pleaded guilty in the Victorian County Court to raping an intoxicated woman he drove back to his house.

Uber drivers are prompted to pose for a verification “selfie” every time they get into the car to work.

But police sources have told The Age that scammers are getting around the system’s log-on technology by simply holding up a photograph of the registered account holder.

They say that some authorised ride-share drivers are using the flaw in the technology to run illegal rackets, connecting one account to as many as 10 vehicles and paying a string of employees, many foreign nationals, in cash.