Vision Helpdesk before 5.7.0 (patched in 5.6.10) allows attackers to read user profiles via modified serialized cookie data to vis_client_id.
Exploitability
AV:NAC:LPR:LUI:NScope
S:UImpact
C:LI:NA:N4.3/CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:NOther