Microsoft is investigating new publicly reported vulnerability in Internet Explorer. If a user is using a version of Internet Explorer that is not running in Protected Mode an attacker may be able to access files with an already known filename and location. The vulnerability exists due to content being forced to render incorrectly from local files in such a way that information can be exposed to malicious websites.
The versions not running in Protected Mode include Internet Explorer 5.01 Service Pack 4 on Microsoft Windows 2000 Service 4; Internet Explorer 6 Service Pack 1 on Microsoft Windows 2000 Service Pack 4; and Internet Explorer 6, Internet Explorer 7, and Internet Explorer 8 on supported editions of Windows XP Service Pack 2, Windows XP Service Pack 3, and Windows Server 2003 Service Pack 2. Protected Mode prevents exploitation of this vulnerability and is running by default for versions of Internet Explorer on Windows Vista, Windows Server 2008, Windows 7, and Windows Server 2008.
There's no patch released yet. More information including some workarounds can be read from the security advisory.
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