An issue was discovered in Znuny and Znuny LTS 6.0.31 through 6.5.7 and
Znuny 7.0.1 through 7.0.16 where a logged-in user can upload a file (via a
manipulated AJAX Request) to an arbitrary writable location by traversing
paths. Arbitrary code can be executed if this location is publicly
available through the web server.