BugTraq
Guestserver guestbook system vulnerabilities Dec 11 2005 05:42PM
jaakko ritke fi

The poor security and input validation at Guestserver versions below 5 ( there are still lots of them out there ) allow all HTML tags inside a message and it can be exploited as much as you want to.

http://www.stud.ntnu.no/~larsell/guestserver/

A Google Search for "Guestbook by Guestserver - v4.12" for example comes up with tons of vulnerable sites.

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