The Frontend Dashboard WordPress plugin before 3.0.5, ProfileGrid WordPress plugin before 6.0.0.5 do not prevent an unauthenticated user from storing a serialized PHP object in user metadata that is deserialized when a public profile is viewed, allowing PHP object injection that can lead to arbitrary file write and potential remote code execution.
https://wpscan.com/vulnerability/c156065f-76f1-4f44-bc57-b7d57560813f/