The Link Library WordPress plugin before 7.9.4 does not sanitise and escape a parameter before reflecting it back in a response, allowing unauthenticated attackers to perform Reflected Cross-Site Scripting attacks against users who can be tricked into performing an action.
https://wpscan.com/vulnerability/3b6c0efb-c503-437a-8f9b-f8a8c032313c/