Cross-site scripting (XSS) vulnerability in the management interface in Microsoft FAST ESP 5.1.5 and earlier allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.
Microsoft SharePoint uses URLs with the same hostname and port number for a web site's primary files and individual users' uploaded files (aka attachments), which allows remote authenticated users to leverage same-origin relationships and conduct cross-site scripting (XSS) attacks by uploading HTML documents.