The wphttpvalidate_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.
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "binary_version": "4.4.2+dfsg-1", "binary_name": "wordpress" }, { "binary_version": "4.4.2+dfsg-1", "binary_name": "wordpress-l10n" }, { "binary_version": "4.4.2+dfsg-1", "binary_name": "wordpress-theme-twentyfifteen" }, { "binary_version": "4.4.2+dfsg-1", "binary_name": "wordpress-theme-twentyfourteen" }, { "binary_version": "4.4.2+dfsg-1", "binary_name": "wordpress-theme-twentysixteen" } ] }