Microsoft issues unauthorized certificate warning, patch

http://technet.microsoft.com/en-us/security/advisory/2718704

Microsoft has issued a rather serious security advisory via TechNet, affecting virtually every currently supported Windows product, and issued a patch to correct the problem. The threat stems from unauthorized Microsoft Certificates being used to spoof content and carry out phishing attacks.

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Story added 4. June 2012, content source with full text you can find at link above.