Microsoft will release two security bulletins with security updates for Windows and Office, as part of its monthly patching cycle.
The alert for Office is deemed "critical," Microsoft's highest risk rating, the company said in a notice posted on its Web site on Thursday. The Windows bulletin is rated "important," one notch lower on Microsoft's rating system.
Microsoft rates as critical any security threat that could allow a malicious Internet worm to spread without any action required on the part of the user. Problems deemed "important" could be exploited to compromise the confidentiality, integrity or availability of data, or the integrity or availability of processing resources, according to the company.