Patches 31 vulnerabilities, including bug used in Pwn2Own hacking contest to break IE8

Microsoft today issued 10 security updates that patched a record 31 vulnerabilities in Windows, Internet Explorer (IE), Excel, Word, Windows Search and other programs, including 18 bugs marked "critical."

Of the 10 bulletins, six patched some part of Windows, while three patched an Office application or component, and one fixed a flaw in IE. Eighteen of the 31 bugs were ranked critical, Microsoft's most serious ranking in its four-step score, while 11 were tagged as "important," the next-lowest label, and two were judged "moderate."

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