Microsoft and security authorities are warning of a critical, unpatched script vulnerability in Internet Explorer 6 that can allow a hacker to take complete control of a Windows PC.
Experts have noted that, while the flaw is serious, those wishing to exploit it would have to entice users to click a link that takes them to a specially crafted Web site. In addition, for a PC to be affected, it must be running in administrator mode.
Those whose accounts are configured to have fewer user rights are less vulnerable than users who operate their PCs with full admin rights turned on.
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News Source:
Yahoo 
Exploit Published for Critical IE 6 Vulnerability 
