Sometime last week, the German Government stepped up right out urging the general public to temporarily ceases using to IE9 and strongly suggested that they switch web browsers to the like of Firefox,Chrome or others. Microsoft had made several Security Advisories, and most of us already have the patches installed to address the vulnerability. If not you should.
The Microsoft Security Advisory (2757760) outlines the severity and vulnerability and should not by any means be taken lightly. There was an effective fix via the "Fix it" available prior to the complete patch on September 19, and Microsoft made a the full patch available 2 days later.
Microsoft released a Cumulative Security Update for Internet Explore (2744842), on September 21 and it comes strongly recommend to install and be sure that the patch is installed as soon as possible. These types of Zero day vulnerabilities are quite dangerous, since they occur before the patches are made available to fix and prevent further exploits. For those that are already working with the new Windows 8 and IE 10, they will not be affected.
"This security update resolves one publicly disclosed and four privately reported vulnerabilities in Internet Explorer. The most severe vulnerabilities could allow remote code execution if a user views a specially crafted webpage using Internet Explorer. An attacker who successfully exploited any of these vulnerabilities could gain the same user rights as the current user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.”
Many users already have automatic updating enabled and may not actually need to do anything at all. Yet many a time we have seen or worked on others folks PCs that have not seen an update or pattern of solid maintenance for quite some time. The severity and type of havoc that un-patched creates havoc that affects many more users than any one personal user.