Microsoft will send out six security bulletins, four of them for problems rated "critical," the company's highest severity rating, on Patch Tuesday, June 12. All four of the most serious vulnerabilities, in Windows and in IE, can lead to systems getting hijacked.
Three of the critical problems are in Windows; one is in Internet Explorer, one is in Outlook Express and Windows Mail, and there is one "important" fix for Visio. Also, a moderate bug has been found in Windows.
Four Critical Fixes Coming for Windows, IE, Mail