Cross-site scripting (XSS) vulnerability in Opera before 9.63 allows remote attackers to inject arbitrary web script or HTML via built-in XSLT templates.
http://www.securitytracker.com/id?1021462
http://www.opera.com/support/kb/view/924/
http://www.opera.com/docs/changelogs/linux/963/
http://security.gentoo.org/glsa/glsa-200903-30.xml