Security hole fix needed

Looking for a programmer to fix a security issue that has allowed scammers to exploit a website and submit a script that takes advantage of emails sent from the website and comments posted to the site. Code will need to be cleaned and site reuploaded. Solution could require updating web platforms, removing suspicious files or script that doesn't affect the function of the site, submitting the site to the proper source for checking, and uploading the site so that it's operational once again.