CVE-2018-17780
Telegram Desktop (aka tdesktop) 1.3.14, and Telegram 3.3.0.0 WP8.1 on Windows, leaks end-user public and private IP addresses during a call because of an unsafe default behavior in which P2P connections are accepted from clients outside of the My Contacts list.
Date published : 2018-09-29
http://www.securityfocus.com/bid/105521
https://www.inputzero.io/2018/09/bug-bounty-telegram-cve-2018-17780.html