Rank Math SEO < 1.0.229 - Unauthenticated User and Term Metadata Insert/Update/Deletion

Description

The plugin is vulnerable to unauthorized modification and loss of data due to a missing capability check on the 'update_metadata' function. This makes it possible for unauthenticated attackers to insert new and update existing metadata beginning with 'rank_math', and delete arbitrary existing user metadata and term metadata. Deleting existing usermeta can cause a loss of access to the administrator dashboard for any registered users, including Administrators.