An incorrect implementation of "XEP-0280: Message Carbons" in multiple XMPP clients allows a remote attacker to impersonate any user, including contacts, in the vulnerable application's display. This allows for various kinds of social engineering attacks. This CVE is for profanity (0.4.7 - 0.5.0).
https://rt-solutions.de/wp-content/uploads/2017/02/CVE-2017-5589_xmpp_carbons.pdf
https://rt-solutions.de/en/2017/02/CVE-2017-5589_xmpp_carbons/
https://github.com/boothj5/profanity/commit/8e75437a7e43d4c55e861691f74892e666e29b0b