Opera before 10.54 on Windows and Mac OS X, and before 10.60 on UNIX platforms, does not properly restrict access to the full pathname of a file selected for upload, which allows remote attackers to obtain potentially sensitive information via unspecified DOM manipulations.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11669
http://www.vupen.com/english/advisories/2010/1673
http://www.vupen.com/english/advisories/2010/1529
http://www.securityfocus.com/bid/40973
http://www.opera.com/support/search/view/960/
http://www.opera.com/docs/changelogs/windows/1054/
http://www.opera.com/docs/changelogs/unix/1060/