The Find Friends exploit and the Bulk Registration Exploit menace the security and privacy of million of Snapchat users. Gibson Security has published the details of a couple of SnapChat vulnerabilities which could be exploited by hackers respectively to massively disclose users and associated phone numbers. The researchers demonstrated that using a script (dubbed find_friends exploit) invoking API of Snapchat they are able to associate phone numbers with user names and account privacy levels.”]
Source: https://securityaffairs.co/wordpress/20785/hacking/snapchat-vulnerabilities.html