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Zomato fixed a Security bug that allowed hackers to access Personal data of 62 Million users

Insecure Direct Object Reference - It gets the information only based on the "browser_id" parameter passed in a HTTP GET request and fails to verify the user is authorized to access the requested data

Zomato, an online restaurant search and discovery service providing information on home delivery, dining-out, cafés and nightlife to various cities across India and 21 other countries, has fixed a bug which could allow an attacker to gain access to personal information of million users.

Anand Prakash, discovered Insecure Direct Object Reference(IDOR) vulnerability in the Zomato website.

IDOR occurs when an application provides direct access to objects based on user-supplied input. The vulnerability allows the attackers to bypass authorization and access resources in the system directly by modifying the value of a parameter used to directly point to an object, for example database records or files.

One of the API calls used for retrieving the users information is insecurely coded.  It gets the information only based on the "browser_id" parameter passed in a HTTP GET request and fails to verify the user is authorized to access the requested data.

By sequentially changing the 'browser_id' value, an attacker is able to access the users' personal information, such as Names, Email addresses, phone numbers, Date of birth.

"The data leaked also had Instagram access token which could be used to see private photos on Instagram of respective Zomato users,” Prakash wrote in his blog.

Prakash reported the vulnerability to Deepinder Goyal, CEO of Zomato, On June 1. And the next day (June 2), the flaw was fixed by Gunjan Patidar along with his engineering team.

You can also check the Proof of concept Video:


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