wp-admin/user-new.php in WordPress before 4.9.1 sets the newbloguser key to a string that can be directly derived from the user ID, which allows remote attackers to bypass intended access restrictions by entering this string.
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "binary_version": "4.9.5+dfsg1-1", "binary_name": "wordpress" }, { "binary_version": "4.9.5+dfsg1-1", "binary_name": "wordpress-l10n" }, { "binary_version": "4.9.5+dfsg1-1", "binary_name": "wordpress-theme-twentyfifteen" }, { "binary_version": "4.9.5+dfsg1-1", "binary_name": "wordpress-theme-twentyseventeen" }, { "binary_version": "4.9.5+dfsg1-1", "binary_name": "wordpress-theme-twentysixteen" } ] }