WordPress 4.3 broke meta redirect (with url params plugin)

You need to allow the content attribute of a meta tag to contain a shortcode, eg in your “functions.php” add:

add_filter( 'wp_kses_allowed_html', function ( $allowedposttags, $context ) {
    if ( $context == 'post' ) {
        $allowedposttags['meta']['content'] = 1;
    }
    return $allowedposttags;
}, 10, 2 );

and then your original (without the quotes in param=link)

<META HTTP-EQUIV="Refresh" CONTENT="3; URL=[urlparam param=link]">

should work.