Cross-site scripting (XSS) vulnerability in the chat client in IBM Lotus Sametime 7.5 and 7.5.1 allows user-assisted remote attackers to inject arbitrary web script or HTML via a crafted message, which triggers code execution after a mouseover event initiated by the victim.

More... (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2008-0354)