Security researcher @ZHacker13 discovered a flaw in Instagram that allowed an attacker to access account information, including user phone number and real name. The social network giant has finally fixed the flaw. A Facebook spokesman explained that his company modified the contact importer in Instagram to address the flaw to prevent potential abuse. A week before the researcher disclosed the bug, phone numbers associated with 419 million accounts of the social network were exposed online. It is not clear if the two incidents could have the same root cause.”]
Source: https://securityaffairs.co/wordpress/91253/hacking/instagram-bug-data-exposure.html