Language: PHP
Label: vulnerable
CWE: CWE-352 \u2014 Cross-Site Request Forgery (CSRF)
The web application does not, or can not, sufficiently verify whether a well-formed, valid, consistent request was intentionally provided by the user who submitted the request.

Code:
function save_query($query) {
    global $table_prefix;	// table prefix;
    global $conn;			// MySQL connection variable.
    $query = json_encode($query);
    $conn->query("INSERT INTO {$table_prefix}latest_queries (query_value) VALUES ($query)");

}