The links panel in Opera before 9.62 processes Javascript within the context of the "outermost page" of a frame, which allows remote attackers to inject arbitrary web script or HTML via cross-site scripting (XSS) attacks.
https://exchange.xforce.ibmcloud.com/vulnerabilities/46220
http://www.securitytracker.com/id?1021127
http://www.opera.com/support/search/view/907/
http://security.gentoo.org/glsa/glsa-200811-01.xml
http://secunia.com/advisories/32538
http://lists.opensuse.org/opensuse-security-announce/2008-10/msg00012.html