Directory Traversal might not be considered as a high-impact vulnerability but it can be a stepping stone to information leak and shell upload vulnerability. The lack of directory traversal security can allow an attacker to manipulate the file path to gain unauthorized access to different files in the directory. You need penetration testing to detect the directory traversal vulnerability. This video is a short explanation of how the file traversal vulnerability can be exploited, and how you can avoid it.

Clickjacking is an interface-based attack where the hacker manipulates the CSS of a website to insert a malicious iframe, button, or link which hides behind a seemingly harmless button of link. It takes the user to a malicious page and triggers some unsolicited action on the user's behalf. A clickjacking attack may be used to trigger a malware download, loss of content, or money, among other things. You can detect it with the help of penetration testing.