The Accellion File Transfer Appliance (FTA) before FTA_9_12_40 allows local users to add an SSH key to an arbitrary group, and consequently gain privileges, via unspecified vectors.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2016-3437
http://www.kb.cert.org/vuls/id/505560
http://devco.re/blog/2016/04/21/how-I-hacked-facebook-and-found-someones-backdoor-script-eng-ver/