A major security remote code execution (RCE) vulnerability discovered in the Microsoft Internet Explorer set data security agencies on high alert. Microsoft noted that 1 in every 500 internet users were exposed to the vulnerability through unsafe websites. The exploit allows hackers to remotely execute code over an IE session to gain access to, and comprimise a machine. In a security advisory updated today, Microsoft claims to have acted on the vulnerability by issuing a critical security update MS08-078 that went online at 1:00 PM, EST. The hotfix is available for all current versions of the web browser through Microsoft Update.