Uber said that hackers compromised personal data from some 57 million riders and drivers in a breach kept hidden for a year.
"None of this should have happened, and I will not make excuses for it," said a statement from chief executive Dara Khosrowshahi, who took over at the ride-sharing giant in August.
Two members of the Uber information security team who "led the response" that included not alerting users that their data was breached were let go from the San Francisco-based company effective on Wednesday, according to Khosrowshahi.
The Uber chief said he only recently learned that outsiders had broken into a cloud-based server used by the company for data and downloaded a "significant" amount of information.
Stolen files included names, email addresses, and mobile phone numbers for riders, and the names and driver license information of some 600,000 drivers, according to Uber.
Uber paid the hackers USD 100,000 to destroy the data, not telling riders or drivers whose information was at risk, according to a source familiar with the situation.
Co-founder and ousted chief Travis Kalanick was advised of the breach shortly after it was discovered, but it was not made public until Uber's new boss Khosrowshahi learned of the incident.
"You may be asking why we are just talking about this now, a year later," Khosrowshahi said.
"I had the same question, so I immediately asked for a thorough investigation of what happened and how we handled it."
Khosrowshahi said that what he learned about Uber's failure to notify users or regulators prompted corrective actions.
Uber is notifying drivers whose license numbers were swiped and offering them credit and identity theft protection.
The company also said it is notifying regulators, and monitoring affected rider accounts for signs of fraud.
"While I can't erase the past, I can commit on behalf of every Uber employee that we will learn from our mistakes," Khosrowshahi said.
"We are changing the way we do business."
Khosrowshahi inherited a litany of scandals and a toxic workplace culture when he replaced Kalanick.
Kalanick's brash style has been credited with driving Uber to the leading spot in the smartphone-summoned ride market but also blamed for fostering an atmosphere of impropriety and rule-breaking at the company.
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