The list includes millions of popular Instagram users, among which are reportedly some high-profile influencers and celebrities.
Security researcher Anurag Sen discovered the database and alerted TechCrunch. As per the report, the data contained influencers' Instagram handles, bios, verification status, location, email, and phone number.
According to TechCrunch, an Instagram database containing the private information of 49 million members, was accidentally left exposed on Amazon Web Services.
The database was discovered by an Indian researcher, who then contacted United States technology news outlet TechCrunch, the BBC reports.
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According to U.S. website TechCrunch, which first reported the incident, the details of more than 49 million users, including private contact information such as email addresses and phone numbers, were all easily accessible.
It is being said that each database record contained a record that calculated the worth of each account, based off the number of followers, engagement, reach, likes and shares they had. This was used to determine how much the company could pay an influencer or celebrity to post an advertisement, TechCrunch reported. It's also not clear whether the phone numbers and emails in Chtrbox's database came from Instagram.
"We're looking into the issue to understand if the data described - including email and phone numbers - was from Instagram or from other sources", an Instagram spokesperson told Engadget.
The database has now been pulled offline by Chtrbox, but it is still unclear how the company managed to grab hold of private contact information of celebrities.