Some vulnerabilities have been reported in Opera, which can be exploited by malicious people to conduct cross-site scripting attacks or potentially to compromise a user's system.
1) Certain parameters passed to the "History Search" functionality are not properly sanitised before being used. This can be exploited to inject arbitrary HTML and script code, which is executed in a user's browser session when the malicious data is being viewed.
Successful exploitation allows e.g. changing Opera's preferences, which can further be exploited to execute arbitrary commands.
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Subject: Opera Command Execution and Cross-Site Scripting
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