"Simple Upload 53" Vulnerability allows Hacker to upload Shell

Web Application vulnerability in "Simple Upload 53" PHP file allows an attacker to upload Backdoor shell code in your website.

"inurl:simple-upload-53.php"
using this google search , you can find the vulnerable Sites.

If you want to find the vulnerability in your web application, use this google dark:
"inurl:simple-upload-53.php site:Your-Site.com"

After you search in google; if you find any