The UserPlus plugin for WordPress suffers from an incorrect privilege assignment vulnerability (CWE-266) due to improper capability checks in the 'save_metabox_form' function. Authenticated attackers with editor-level permissions or above can exploit this flaw to change the registration form role to administrator, resulting in privilege escalation. The vulnerability affects versions up to and including 2.0. The CVSS 3.1 base score is 7.2, indicating high severity with network attack vector, low attack complexity, high privileges required, no user interaction, and impacts on confidentiality, integrity, and availability.

Successful exploitation allows an authenticated user with editor-level permissions or higher to escalate their privileges to administrator by modifying user roles via the registration form. This can lead to full administrative control over the WordPress site, compromising confidentiality, integrity, and availability of the affected system.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict editor-level access to trusted users only and consider disabling or limiting the use of the UserPlus plugin if possible. Monitor for updates from the vendor and apply patches promptly once available.