Multiple cross-site scripting (XSS) vulnerabilities in PhotoPost PHP Pro 5.x allow remote attackers to inject arbitrary web script or HTML via the (1) cat, (2) password, (3) ppuser, (4) sort, or (5) si parameters to showgallery.php, the (6) ppuser, (7) sort, or (8) si parameters to showmembers.php, or (9) the photo parameter to slideshow.php.