The plugin does not validate, sanitise and escape the IP address of requests logged by the click tracking feature, allowing unauthenticated attackers to perform Cross-Site Scripting attacks against admin viewing the tracked requests.
View the template here CVE-2021-25078.yaml
References:
https://wpscan.com/vulnerability/d4edb5f2-aa1b-4e2d-abb4-76c46def6c6e