Update WordPress user password by email address

update-user-by-email.php

<?php
/**
 * Update an existing user by email address
 *
 * @author Code Parrots <support@codeparrots.com>
 */

function update_user_password_by_email() {

	$user = get_user_by( 'email', 'email@example.com' );

	if ( ! $user ) {

		return;

	}

	wp_set_password( 'customPassword123', $user->ID );

}
add_action( 'init', 'update_user_password_by_email' );