The unknown hackers, who called themselves 'TeamUnknown', put out a webpost under the head "OLACABS.COM Hacked..!!" and said Ola's "application design is very poor" and they had been able to access "user details along with credit card transaction history and unused vouchers".
It was not clear if Ola's mobile app was compromised or the attack was restricted to the website, with neither the hackers nor the company providing any details.
The company, in an emailed response, said: "There has been no security lapse, whatsoever to any user data. The alleged hack seems to have been performed on a staging environment when exposed for one of our test runs".
"The staging environment is on a completely different network compared to our production environment, and only has dummy user values exclusively used for internal testing purposes. Security and privacy of customer data is paramount to us at Ola," it added.