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The PHP script in ‘captcha_code_file.php’ creates the image for the captcha and saves the code in a session variable named ‘6_letters_code’.(also known as email injection) For example, hackers can place the following code in one of your form fields and make your form processor script send an email to an unintended recipient: The code above is adding another email address to the CC list of the email.Spammers can send thousands of emails using this exploit.Check for the presence of any “new line” (rn) in those fields.There are programs known as ‘spam-bots’ that leech through the web pages looking for web forms.Your host will not be happy with this and may warn you or even ban your web site.The best way to prevent this spammer exploit is to validate the fields used in the mail() function(fields like email, subject of the email, name etc).Using a contact form on your website is very useful as it helps your web site visitors to communicate with you in an easy and simple way.
When found, those ‘bots’ just fills the fields with a spam message and submits.
Eventually you will start getting many hundred submissions send by those spam bots and you will find it difficult to separate genuine submissions from spam messages. The website visitor is required to read the code on the image and enter the value in a text field.