One of the API in Mattermost version 6.3.0 and earlier fails to properly protect the permissions, which allows the system administrators to combine the two distinct privileges/capabilities in a way that allows them to override certain restricted configurations like EnableUploads.
Exploitability
AV:NAC:HPR:HUI:NScope
S:UImpact
C:LI:LA:N3.3/CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:NOther