[Cobbydaler]

Microsoft has warned customers to apply a temporary security fix to protect against a serious, newly discovered security bug in all supported versions of Windows.
The vulnerability results from the way Windows processes webpages containing MIME-formatted content. Attackers can exploit the weakness to run malicious scripts that steal sensitive information, spoof trusted websites or carry out other actions not authorized by the user. Internet Explorer is the only attack vector for the vulnerability, which resides in the Windows implementation of the MHTML protocol.

Link

Microsoft link:

http://support.microsoft.com/kb/2501696