Cross-site scripting (XSS) vulnerability in kmMail 1.0, 1.0a, and 1.0b allows remote attackers to inject arbitrary web script or HTML via (1) javascript in onmouseover or other attributes in "safe" HTML tags such as the "b" tag, or (2) the Subject field.
http://www.securityfocus.com/bid/6013
http://www.securityfocus.com/bid/5173
http://www.iss.net/security_center/static/9507.php
http://sourceforge.net/forum/forum.php?forum_id=191501
http://lists.grok.org.uk/pipermail/full-disclosure/2002-October/002207.html