The application is vulnerable to an unauthenticated parameter manipulation that allows an attacker to set the credentials to blank giving her access to the admin panel. Also vulnerable to account takeover and arbitrary password change.
Exploitability
AV:NAC:LAT:NPR:NUI:NVulnerable System
VC:NVI:HVA:NSubsequent System
SC:NSI:NSA:N8.7/CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:NOther