Microsoft announced it will release eight security bulletins on this month's Patch Tuesday. Four of the bulletins are rated as critical and one of them will be a patch to fix a critical vulnerability in Internet Explorer that's being exploited in the wild. This IE flaw is also present in Windows 8.1 so this will be the new operating system's first security update (even though it isn't even officially out yet).
Windows XP, which Microsoft is scheduled to stop supporting just over six months from now, will get three out of the four critical updates on Tuesday. PCs with Windows XP Professional x64 Edition Service Pack 2 will use all four critical updates, as will Windows Vista, 7 and 8. Windows RT will get two critical updates, along with another one labeled as "Important".