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As you could notice this morning ,who will have WSUS activated on your servers, the security bulletin MS12-066 http://technet.microsoft.com/en-us/security/bulletin/MS12-066 (KB 2741517) applies to SharePoint 2010 and MOSS 2007. That hotfix fix a vulnerability that allows elevation of privileges.
As the hotfix is critical, it will be installed automaticaly. So, after the installation, it's mandatory to execute PSCONFIG on every single server of the farm => "psconfig –cmd upgrade –inplace b2b -wait" to complete the update process.
Héctor Calvarro Martín. SharePoint Dev/Core. Microsoft Support Escalation Engineer for EMEA.