A server-side injection was possible for a malicious admin to manipulate the application to include a malicious script which is executed by the server. This attack is only possible if the admin uses a client that have been tampered with.
Exploitability
AV:AAC:LPR:HUI:NScope
S:UImpact
C:NI:NA:H4.5/CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:HOther