The Facebook-owned Instagram is now investigating. The website said security researcher Anurag Sen had alerted it after discovering the database so that the owner could be alerted about the breach. Apart from personal contact number, details like email address, bio, profile picture, whether the account is verified or not, number of followers and location including city and country were exposed.
"We're also inquiring with Chtrbox to understand where this data came from and how it became publicly available".More news: Beijing denounces USA warship sail-by in South China Sea
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Chtrbox reportedly pays influencers - users with a big audience, who can persuade their users to act on their recommendations - to post sponsored content on their accounts.
The personal details of multiple Instagram influencers, including celebrities and food bloggers, were also found on the database, as were estimates of each account's commercial worth based on details such as the number of followers and the account's engagement. As TechCrunch explains, this data was "used as a metric to determine how much the company could pay an Instagram celebrity or influencer to post an ad".
The database was reported to lack a password or encryption, and was said to have more than 49 million records in it before being taken offline after a query was made to Chtrbox.