Secunia Research has discovered a vulnerability in Opera, which can be exploited by malicious web sites to spoof dialog boxes.
Inactive tabs can launch dialog boxes so they appear to be displayed by a web site in another tab. This can be exploited by a malicious web site to show a dialog box, which seems to originate from a trusted web site.
Successful exploitation would normally require that a user is tricked into opening a link from a malicious web site to a trusted web site in a new tab.
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Subject: Opera Tabbed Browsing Vulnerability
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