Some vulnerabilities have been reported in Opera, which can be exploited by malicious people to disclose potentially sensitive information, conduct cross-site scripting attacks, bypass certain security restrictions, or to conduct spoofing attacks.

1) An error in the handling of data URIs can potentially be exploited to execute arbitrary script code on sites, which did not directly cause the data URI to be opened.

This vulnerabilities is reported in Opera versions prior to 10.54 on Windows and Mac, and Opera version prior to 10.11 on Linux and FreeBSD.

2) An error in the handling of widgets can be exploited by a malicious widget to create, read, modify, or delete files on the local system.

Successful exploitation requires that a malicious widget is installed with granted File I/O permissions.

This vulnerability affects Opera for Windows and Mac.

3) An error in the handling of Internationalized Domain Names (IDN) can be exploited to spoof a trusted URL.

4) A weakness is caused due to an error in the handling of file upload forms, which can be exploited to disclose path information of selected files.

Solution
Update to version 10.54 for Windows and Mac or version 10.60 for Linux and FreeBSD.
Further details available to Secunia VIM customers

Provided and/or discovered by
Reported by the vendor.

Changelog
Further details available to Secunia VIM customers

Original Advisory
http://www.opera.com/docs/changelogs/windows/1054/
http://www.opera.com/support/kb/view/954/
http://www.opera.com/support/search/view/955/
http://www.opera.com/support/kb/view/960/
http://www.opera.com/support/kb/view/961/
http://www.opera.com/support/kb/view/962/

Other references
Further details available to Secunia VIM customers

Deep Links
Links available to Secunia VIM customers