Your security team might report vulnerability for the default WildFly welcome page of the amdinUI.
https://<adminUI server>:8443
or
http://<adminUI server>:8080
The welcome page can be customized under <siteminder install folder>/adminui/welcome-content/ folder.
You may remove (backup if you like) all the files currently in the folder, and put whatever the new welcome page you like in the folder, such as a blank page, or your company logo, etc.
The example here will redirect to the adminUI login page -- put following index.html to the /adminui/welcome-content/ folder,
<html>
<head>
<meta http-equiv="refresh" content="0;URL=/iam/siteminder/adminui">
</head>
</body>
</html>