If the server-side code simply looks for a file named after the page parameter, it might accidentally move up four levels from the web directory and serve a file from the server's root directory instead of the template folder. Why Is This Dangerous?
: By repeating ..-2F multiple times, the attacker is attempting to "climb" out of the intended folder (the web root) and reach the base operating system folders.
In some cases, if an attacker can upload a file and then "traverse" to it to execute it, they can take full control of the server.
Never trust user input. Use "Whitelisting" to allow only specific, known template names. If the input doesn't match the list, reject it.
The string "-template-..-2F..-2F..-2F..-2Froot-2F" might look like a random jumble of characters to the average user, but to a cybersecurity professional, it is a glaring red flag. This specific pattern is a classic indicator of a (or Directory Traversal) attack targeting web templates.
