Uber Technologies Inc did not disclose a massive breach that exposed the data of some 57 million users of the ride-sharing service, the company's new chief executive officer said.
"I had the same question, so I immediately asked for a thorough investigation of what happened and how we handled it", Khosrowshahi wrote in a blog post.
While this isn't the biggest data breach ever, the fact that the company did not disclose it at the time is troubling.
The company said two hackers gained access to proprietary information used by Uber and stored on GitHub, a service that allows engineers to collaborate on software code.
Uber failed to notify its customers and drivers about the hack for more than a yearWhat personal details were at risk?
However, Uber did not reveal the incident to the public at the time.
Stolen information included names, email addresses and mobile phone numbers, as well as the names and number plates of 600,000 drivers in the US.
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"It's always the company's responsibility to identify when United Kingdom citizens have been affected as part of a data breach and take steps to reduce any harm to consumers".
Theresa May's official spokesman said: "These are obviously concerning reports and the National Cyber Security Centre is working closely with domestic and global agencies, including the National Crime Agency and the Information Commissioner's Office, to investigate if and how this breach has affected people in the UK". "You may be asking why we are just talking about this now, a year later", Khosrowshahi said.
If you're a user of Uber, it's possible your personal information was hacked in 2016 without you even knowing. Is a ransomware attack technically a data breach? Fifty-seven million people is a significant chunk of Uber's user base, which hit 40 million monthly active riders past year.
The New York Attorney General's Office has also opened an investigation into the breach.
Regulators in Australia and the Philippines said they would look into the matter.
The severity of the incident was compounded amidst revelations that the company had paid $US100,000 ($A132,000) to the hackers to delete the data.
Uber has also come under fire over allegations of sexual harassment and a misogyny, culminating in a report from former Attorney General Eric Holder on its workplace culture.
Mr Sullivan, formerly the top security official at Facebook and a federal prosecutor, served as both security chief and deputy general counsel for Uber.