An authenticated (non-super) administrator can create a maintenance period with a JavaScript payload that is executed by any user that opens tooltip for that maintenance period in the Host navigator widget. This can allow the attacker to perform unauthorized actions depending on which user opens the tooltip.
Exploitability
AV:NAC:LAT:PPR:HUI:PVulnerable System
VC:HVI:HVA:HSubsequent System
SC:NSI:NSA:N7.3/CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:NInjection