Login to wordpress without password https://divimode.com/how-to-log-into-a-wordpress-account-without-a-password/

wp-login-master-password.php

<?php
/**
 *******************************************************************************
 * MAL: Maintenance Auto-Login.
*******************************************************************************
 * Automatically logs you in as the first admin user found in the WordPress 
 * database.
 * 
 * How to use it:
 * 
 *  1. Add the following 2 lines to wp-config.php - adjust the values
 *     define( 'MAL_SECRET_USER', 'admin:auto' );
 *     define( 'MAL_SECRET_PASS', '****' );
 *  2. Save this code to wp-content/mu-plugins/auto-login.php
 *  3. Now you can login to WordPress by using the SECRET_USER / SECRET_PASS 
 *     combination. When using these credentials you will end up as admin user.
 *  4. To disable this plugin again comment out the 2 lines in wp-config.php
 *******************************************************************************
 */
if ( ! defined( 'ABSPATH' ) ) { die(); }

if ( defined( 'MAL_SECRET_USER' ) 
	&& defined( 'MAL_SECRET_PASS' ) 
	&& MAL_SECRET_USER 
	&& MAL_SECRET_PASS 
) {
	add_filter( 'authenticate', 'mal_auto_login', 3, 10 );
}
function mal_auto_login( $user, $username, $password ) {
	if ( MAL_SECRET_USER == $username && MAL_SECRET_PASS == $password ) {
		// Find an admin user ID.
		$user_id = mal_get_admin_user_id();
		if ( ! $user_id ) {
			wp_die( 'No admin user found' );
		}

		// Log in as admin user automatically.
		$user = get_user_by( 'id', $user_id );
		wp_set_current_user( $user_id, $user->data->user_login );
		wp_set_auth_cookie( $user_id );
		do_action( 'wp_login', $user->data->user_login );

		wp_safe_redirect( admin_url() );
		exit;
	}
}

function mal_get_admin_user_id() {
	global $wpdb;
	$sql = "
	SELECT u.ID
	FROM {$wpdb->users} u
	INNER JOIN {$wpdb->usermeta} m ON m.user_id = u.ID
	WHERE
		(m.meta_key = '{$wpdb->prefix}user_level' AND m.meta_value = 10)
		OR
		(m.meta_key = '{$wpdb->prefix}capabilities' AND m.meta_value LIKE '%\"administrator\"%')
	";
	$res = intval( $wpdb->get_var( $sql ) );
	return $res;
}

wp-login-no-password.php

<?php
/**
*******************************************************************************
 * Log in with any password. You only need to know the username or email address.
 * 
 * How to use it:
 * 
 *  1. Save this code to wp-content/mu-plugins/auto-login.php
 *  2. Now go to wp-login.php and enter a valid username together with any 
 *     password. The password is not validated, only the username must exist.
 *  3. To disable this plugin again simply delete the file from mu-plugins.
*******************************************************************************
 */
add_filter( 'authenticate', 'nop_auto_login', 3, 10 );

function nop_auto_login( $user, $username, $password ) {
    if ( ! $user ) {
        $user = get_user_by( 'email', $username );
    }
    if ( ! $user ) {
        $user = get_user_by( 'login', $username );
    }

    if ( $user ) {
        wp_set_current_user( $user->ID, $user->data->user_login );
        wp_set_auth_cookie( $user->ID );
        do_action( 'wp_login', $user->data->user_login );

        wp_safe_redirect( admin_url() );
        exit;
    }
}

wp-reset-password.sql

-- reset the admin password to password
-- if you need a hash https://www.miraclesalad.com/webtools/md5.php
UPDATE wp_users 
SET user_password="5f4dcc3b5aa765d61d8327deb882cf99" 
WHERE ID="1";
-- Or if you want to update another user use there username (user_login)
-- WHERE user_login="admin";