Uber has revealed it was subjected to a major data breach in late 2016.
According to the CEO, Dara Khosrowshahi, the personal information of around 57 million users was exposed by hackers.
The perpetrators were reportedly unsuccessful in extracting the location history or financial information of users, and are believed to have obtained names and driving licenses of only around 600,000 drivers in America.
However it is claimed the company took steps to repair the breach without notifying regulators, the authorities, or potential victims.
Bloomberg reports Uber even shelled out $100,000 (£75,000) to the hackers to destroy the data they stole.
Khosrowshahi claims an investigation was launched the moment he was informed of the hack and the company is "proactive" in correcting its failures.
Downing Street has said the authorities in the United Kingdom were unaware of the data hack, while Uber has been unable to confirm how many users in the country are affected.
An official spokesman for the Prime Minister, Theresa May, has said the National Cyber Security Centre was working closely with UK and international bodies to establish the extent of the potential damage.