Multiple cross-site scripting (XSS) vulnerabilities in the Paid Memberships Pro (PMPro) plugin before 1.8.4.3 for WordPress allow remote attackers to inject arbitrary web script or HTML via the (1) s parameter to membershiplevels.php, (2) memberslist.php, or (3) orders.php in adminpages/ or the (4) edit parameter to adminpages/membershiplevels.php.