Multiple cross-site scripting (XSS) vulnerabilities in showgallery.php in PhotoPost before 4.86 allow remote attackers to inject arbitrary web script or HTML via the (1) cat, (2) si, (3) page, or (4) ppuser parameters.
https://exchange.xforce.ibmcloud.com/vulnerabilities/18744
http://www.securityfocus.com/bid/12156
http://www.gulftech.org/?node=research&article_id=00063-01032005