VFront 0.99.5 has stored XSS via the admin/sync_reg_tab.php azzera parameter, which is mishandled during admin/error_log.php rendering.
https://www.netsparker.com/web-applications-advisories/
http://packetstormsecurity.com/files/153104/VFront-0.99.5-Persistent-Cross-Site-Scripting.html