I few days ago I’ve done some tests with Firefox add-on called User Agent Switcher. What I was trying to test is how social networks (Twitter, Facebook, Foursquare) react to sudden change in user agent. But then I came to a better idea. User agents, along with other data from your browser (browser info) and PC, are being increasingly used to track users on the web for marketing and security reasons. These data are in the core of systems called cookieless device fingerprinting. Number of websites that use this type of data is growing as we speak. If you don’t control how you store an show this data in your admin panel there is an easy way for you to get XSSed. In this post I’ll show you how.
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