The Library Viewer WordPress plugin before 3.2.0 does not sanitise and escape some parameters before outputting them back in the page, leading to a Reflected Cross-Site Scripting which could be used against high privilege users such as admin.
Exploitability
AV:NAC:LPR:NUI:RScope
S:CImpact
C:LI:LA:L7.1/CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L