The "PHP Email Form Validation v3.1" script fails to validate the $email and $subject inputs for line-break characters before passing them to the PHP mail() function .
in v3.1 was a misguided trust in client-side validation. Developers assumed that because the JavaScript blocked empty fields, the PHP backend didn't need strict filtering. This assumption led to a classic Unvalidated Input → Email Header Injection vulnerability. php email form validation - v3.1 exploit
parameters are not sufficiently sanitized before being passed to internal functions, allowing an attacker to inject malicious PHP code. Vulnerability Details Vulnerability Type: Remote Code Execution (RCE) / Input Validation Bypass Affected Version: HTTP POST Request The "PHP Email Form Validation v3
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