opera -- "data:" URI handler spoofing vulnerability

A Secunia Advisory reports:

Michael Holzt has discovered a vulnerability in Opera, which can be exploited by malicious people to trick users into executing malicious files.

The vulnerability is caused due to an error in the processing of "data:" URIs, causing wrong information to be shown in a download dialog. This can be exploited by e.g. a malicious website to trick users into executing a malicious file by supplying a specially crafted "data:" URI.

[source]