Cross-site scripting (XSS) vulnerability in Sun iPlanet Messaging Server Messenger Express allows remote attackers to inject arbitrary web script via the expression Cascading Style Sheets (CSS) function, as demonstrated by setting the width style for an IMG element.  NOTE: this issue might be related to CVE-2006-5486, however due to the vagueness of the initial advisory and different researchers, it has been assigned a new CVE.