WP System Log < 1.0.21 - Unauthenticated Stored Cross-Site Scripting
The plugin does not sanitise, validate and escape the IP address retrieved from login requests before outputting them in the admin dashboard, which could allow unauthenticated attacker to perform Cross-Site Scripting attacks against admins viewing the logs.
Proof of Concept
POST /wp-login.php HTTP/1.1
Accept-Encoding: gzip, deflate
The XSS will be triggered in the Activity Log dashboard: /wp-admin/admin.php?page=winteractivitylog