Multiple cross-site scripting vulnerabilities in PostNuke 0.760-RC3 allow remote attackers to inject arbitrary web script or HTML via the (1) module parameter to admin.php or (2) op parameter to user.php. NOTE: the vendor reports that certain issues could not be reproduced for 760 RC3, or for .750.  However, the op/user.php issue exists when the pnAntiCracker setting is disabled.