Online Grades is the leading free-software project that allows K-12+ student grades attendance information to be posted onto a dynamic web site.
Online Grades suffers from multiple cross-site scripting vulns. The issue is triggered when input passed via multiple parameters to the 'admin/admin.php' script is not properly sanitized before being returned to the user. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.