full-disclosure - XSS in cookie

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Message-ID: <E1BIoPp-000MnF-00.offtopic-mail-ru@f15.mail.ru>
From: offtopic at mail.ru ("offtopic" )
Subject: XSS in cookie

Hi List.

I found XSS in cookie on an Web-application.
So, if i use special-crafted cookie, I can run XSS attak against the site users.
To accomplish attack I must modify cookie on client computer, which I can do by  XSS :-)

Is it vulnerability and if it is, how to use this attack?

Thank you, and sorry for my English,

(c)oded by offtopic@...l.ru