There is a flaw in IE that could allow criminals to hack into your computer and steal your passwords. Yeah that is what you call a serious flaw! The flaw was detected in IE7 but Microsoft says it is a vulnerability in all versions of the web surfing software that a majority of the world’s web users still use. Apparently hackers found the vulnerability before Microsoft did which is not good. This flaw has already compromised over 10,000 sites since its discovery.

Here are a few articles that explain the situation well

http://news.bbc.co.uk/2/hi/technology/7784908.stm
http://www.eweek.com/c/a/Security/Hackers-Compromise-Legit-Web-Sites-to-Target-Microsoft-IE-Flaw/
http://computerworld.com/action/article.do?command=viewArticleBasic&articleId=9123338