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.
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.