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May 14, 2014 at 23:05 comment added Søren Løvborg A fourth risk, severe yet easy to miss: Upload of client-side active content, such as JavaScript (including HTML/CSS with embedded JavaScript), Java applets, Flash objects, etc., all of which can be used to perform cookie-stealing attacks and work around same-origin policies. Your website might think the user uploaded a GIF image, when it's really a Java JAR. Always host user uploads on a separate domain, cf. googleusercontent.com, upload.wikimedia.org, etc.
Nov 21, 2010 at 13:40 comment added AviD Also, potential of flooding your server, thus causing DoS.
Nov 19, 2010 at 22:00 vote accept Edgar
Nov 19, 2010 at 8:51 history answered Rory McCune CC BY-SA 2.5