Telegram Desktop (aka tdesktop) 1.3.16 alpha, when "Use proxy" is enabled, sends credentials and application data in cleartext over the SOCKS5 protocol.
{ "binaries": [ { "binary_version": "1.2.17-1", "binary_name": "telegram-desktop" } ] }
{ "binaries": [ { "binary_version": "3.1.1+ds-1~ubuntu20.04.1", "binary_name": "telegram-desktop" } ] }
{ "binaries": [ { "binary_version": "3.6.1+ds-2build1", "binary_name": "telegram-desktop" } ] }