Opera before 11.62 on Mac OS X allows remote attackers to spoof the address field and security dialogs via crafted styling that causes page content to be displayed outside of the intended content area.
https://exchange.xforce.ibmcloud.com/vulnerabilities/74352
http://www.opera.com/support/kb/view/1013/
http://www.opera.com/support/kb/view/1009/
http://www.opera.com/docs/changelogs/windows/1162/
http://www.opera.com/docs/changelogs/mac/1162/
http://secunia.com/advisories/48535
http://lists.opensuse.org/opensuse-security-announce/2012-05/msg00012.html