Mitel ShoreTel 19.46.1802.0 devices and their conference component are vulnerable to an unauthenticated attacker conducting reflected cross-site scripting attacks via the PATH_INFO variable to index.php due to insufficient validation for the time_zone object in the HOME_MEETING& page.
View the template here CVE-2020-28351.yaml
References:
http://packetstormsecurity.com/files/159987/ShoreTel-Conferencing-19.46.1802.0-Cross-Site-Scripting.html