The rich text editing functionality in Opera before 9.25 allows remote attackers to conduct cross-domain scripting attacks by using designMode to modify contents of pages in other domains.
https://exchange.xforce.ibmcloud.com/vulnerabilities/39147
http://www.vupen.com/english/advisories/2007/4261
http://www.securitytracker.com/id?1019131
http://www.securityfocus.com/bid/26937
http://www.opera.com/support/search/view/875/
http://www.opera.com/docs/changelogs/windows/925/
http://www.opera.com/docs/changelogs/linux/925/
http://security.gentoo.org/glsa/glsa-200712-22.xml
http://secunia.com/advisories/28314
http://secunia.com/advisories/28290
http://secunia.com/advisories/28169
http://lists.opensuse.org/opensuse-security-announce/2008-01/msg00001.html