Stefan Esser has discovered a vulnerability in Opera, which can be exploited by malicious people to conduct cross-site scripting attacks.
The vulnerability exist because pages that do not specify a charset inherit the charset of the parent page. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of certain sites that are included e.g. via iframes in a malicious page that uses UTF-7 as charset.
Successful exploitation requires that the user is tricked into visiting a malicious web site.
The vulnerability is confirmed in version 9.10. Other versions may also be affected.
Solution: Update to version 9.20.
Provided and/or discovered by: Stefan Esser
Original Advisory: Hardened-PHP Project:
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Subject: Opera Charset Inheritance Cross-Site Scripting Vulnerability
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