What are the potential issues that may arise when storing $_POST variables in $_SESSION across multiple pages in PHP?

One potential issue that may arise when storing $_POST variables in $_SESSION across multiple pages in PHP is the risk of data manipulation or injection. To mitigate this risk, it is important to validate and sanitize the input data before storing it in the session. This can help prevent malicious users from tampering with the data and causing security vulnerabilities. 

// Validate and sanitize the $_POST data before storing it in the $_SESSION
if(isset($_POST['username'])){
    $username = filter_var($_POST['username'], FILTER_SANITIZE_STRING);
    $_SESSION['username'] = $username;
}

Keywords

$_POST $_SESSION data loss security vulnerability session hijacking

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