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Microsoft issues three critical security patches

Microsoft has distributed four security patches for its Windows operating system and Office productivity suite, three of which are “critical”.

The company said the three critical threats all allowed remote attackers to target users if the patches were not installed.

Two critical patches are available for Office – to correct a flaw in the Excel spreadsheet and a vulnerability in the Outlook e-mail client – while the one for the Windows OS snuffs out a threat via the Vector Markup Language feature.

The company said the fourth security update was an important one, addressing the Office 2003 Brazilian Portuguese grammar checker, which could also let in remote attackers.

Other security patches had been promised by Microsoft last week, but it shelved them for undisclosed reasons. The patches that were released were part of the company’s monthly security update cycle.

Microsoft bulletins and advisories >> 

Microsoft's December security update >>

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