The Fast Forward feature in Opera before 9.61, when a page is located in a frame, executes a javascript: URL in the context of the outermost page instead of the page that contains this URL, which allows remote attackers to conduct cross-site scripting (XSS) attacks.
https://exchange.xforce.ibmcloud.com/vulnerabilities/46004
http://www.vupen.com/english/advisories/2008/2873
http://www.securityfocus.com/bid/31842
http://www.opera.com/support/search/view/904/
http://www.opera.com/docs/changelogs/windows/961/
http://www.opera.com/docs/changelogs/solaris/961/
http://www.opera.com/docs/changelogs/mac/961/
http://www.opera.com/docs/changelogs/linux/961/
http://www.opera.com/docs/changelogs/freebsd/961/
http://www.openwall.com/lists/oss-security/2008/10/22/5
http://www.openwall.com/lists/oss-security/2008/10/21/6
http://security.gentoo.org/glsa/glsa-200811-01.xml
http://secunia.com/advisories/32538
http://secunia.com/advisories/32394
http://secunia.com/advisories/32299
http://lists.opensuse.org/opensuse-security-announce/2008-10/msg00009.html