The ProfileGrid – User Profiles, Groups and Communities plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the pm_decline_join_group_request and pm_approve_join_group_request functions in all versions up to, and including, 5.9.4.4. This makes it possible for authenticated attackers, with Subscriber-level access and above, to approve or decline join group requests which is normally should be available to administrators only.
The product does not perform an authorization check when an actor attempts to access a resource or perform an action.