CDA.xsl in HL7 C-CDA 1.1 and earlier does not anticipate the possibility of invalid C-CDA documents with crafted XML attributes, which allows remote attackers to conduct XSS attacks via a document containing a table that is improperly handled during unrestricted xsl:copy operations.
http://www.securitytracker.com/id/1033511
http://www.securityfocus.com/bid/69633
http://www-01.ibm.com/support/docview.wss?uid=swg21699588
http://motorcycleguy.blogspot.com/2014/04/hl7-cda-stylesheet-patches.html
http://gforge.hl7.org/gf/project/strucdoc/frs/?action=FrsReleaseView&release_id=1088