An issue exists in Znuny and Znuny LTS 6.0.31 up to and including 6.5.7 and Znuny 7.0.1 up to and including 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.
Vulmon