Open Ticket Request System (OTRS) 1.0.0 through 1.3.2 and 2.0.0 through 2.0.3, when AttachmentDownloadType is set to inline, renders text/html e-mail attachments as HTML in the browser when the queue moderator attempts to download the attachment, which allows remote attackers to execute arbitrary web script or HTML. NOTE: this particular issue is referred to as XSS by some sources.
https://exchange.xforce.ibmcloud.com/vulnerabilities/23355
http://www.vupen.com/english/advisories/2005/2535
http://www.securityfocus.com/bid/15537/
http://www.novell.com/linux/security/advisories/2005_30_sr.html
http://www.debian.org/security/2006/dsa-973
http://securityreason.com/securityalert/200
http://secunia.com/advisories/18887
http://secunia.com/advisories/18101
http://secunia.com/advisories/17685/
http://otrs.org/advisory/OSA-2005-01-en/
http://moritz-naumann.com/adv/0007/otrsmulti/0007.txt
http://marc.info/?l=bugtraq&m=113272360804853&w=2
http://lists.grok.org.uk/pipermail/full-disclosure/2005-November/039001.html