Multiple cross-site scripting (XSS) vulnerabilities in the DMSGuestbook 1.7.0 plugin for WordPress allow remote attackers to inject arbitrary web script or HTML via the (1) file parameter to wp-admin/admin.php, or the (2) messagefield parameter in the guestbook page, and the (3) title parameter in the messagearea.

More... (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2008-0617)