Before version 4.8.2, WordPress was vulnerable to a directory traversal attack during unzip operations in the ZipArchive and PclZip components.

The wp_http_validate_url function in wp-includes/http.php in WordPress before 4.4.2 allows remote attackers to conduct server-side request forgery (SSRF) attacks via a zero value in the first octet of an IPv4 address in the u parameter to wp-admin/press-this.php.