Opera Software has released version 9.52 of Opera Browser to address multiple vulnerabilities. It can be downloaded from:

http://www.opera.com/products/desktop/

More information is available in these advisories:

http://www.opera.com/support/search/view/897/
http://www.opera.com/support/search/view/896/
http://www.opera.com/support/search/view/895/
http://www.opera.com/support/search/view/894/
http://www.opera.com/support/search/view/893/
http://www.opera.com/support/search/view/892/

Oher fixes included in version 9.52 are described in the change log:

http://www.opera.com/docs/changelogs/windows/952/