Multiple cross-site scripting (XSS) vulnerabilities pm_popup.php in MKPortal 1.1 Rc1 and earlier, as used with vBulletin 3.5.4 and earlier, allow remote attackers to inject arbitrary web script or HTML via the (1) u1, (2) m1, (3) m2, (4) m3, (5) m4 parameters.
Improper Neutralization of Input During Web Page Generation The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.