+ onet.pl Description:
Onet.pl is the most famous Polish web portal.
It is an interactive communication platform that runs millions e-mail accounts (poczta.onet.pl) system.
That is a possibility to take over an user account from the mail service at http://poczta.onet.pl [and others in *.onet.pl domain] when the logged user would click at specially crafted URL.
Timeline:
2007.03.04 bug discovered
2007.03.04 bug sent via email from http://pomoc.onet.pl/index.html?KAT=1148
2007.03.07 response via email from Abuse Onet
2007.03.30 its fixed now (probably fixed earlier)
Original Advisory: http://kaneda.bohater.net/security/20070304-xss-onet.pl.php