WordPress Core 2.3.3 - 'cat' Directory Traversal

source: https://www.securityfocus.com/bid/28845/info

WordPress is prone to a directory-traversal vulnerability because it fails to sufficiently sanitize user-supplied input data.

Exploiting the issue may allow an attacker to access sensitive information that could aid in further attacks.

WordPress 2.3.3 is vulnerable; other versions may also be affected.

http://www.example.com/wordpress/?cat=1.php/../searchform?