Summary: 1&1 Internet Inc. is using the services of sedoparking.com to display
sponsored listings ads on the websites of his clients when an invalid page 404
is requested. The code from sedoparking.com is vulnerable to XSS cross site
scripting making the majority of websites hosted by 1&1 vulnerable to cross
site scripting.
[... more ...](http://www.xssnews.com/2007/12/27/a-large-number-of-sites-
hosted-by-11-internet-inc-are-vulnerable-to-xss/)
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