The User Management plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 1.2. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for unauthenticated attackers to modify the plugin's export field configuration stored in the uiewp_export_field option, controlling which user fields such as password hashes are included in CSV exports and how columns are mapped during imports.
https://plugins.trac.wordpress.org/browser/user-management/tags/1.2/users-imp-exp-wpexperts.php#L22
https://plugins.trac.wordpress.org/browser/user-management/tags/1.2/includes/model.php#L853
https://plugins.trac.wordpress.org/browser/user-management/tags/1.2/includes/model.php#L729
https://plugins.trac.wordpress.org/browser/user-management/tags/1.2/includes/model.php#L21