Microsoft is releasing six security patches to address 15 vulnerabilities, with half categorised as "critical".
The bulletins affect Windows and Microsoft Office, with the prior requiring a system restart.
But the Office patches may not face such disruption "if the components of the software are not in use", said the Microsoft Security Responce Center.
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Last month Microsoft released a record Patch Tuesday monthly security update for its software, with 13 patches aimed at fixing 34 vulnerabilities. The previous record of 12 security patches in a month was set in February 2007 and matched again in October 2008.