Here is a possibility that the finschia-sdk module can be invoked within a Custom CosmosMsg via SubMsg. Given this, it seems necessary to apply a filter to prevent the use of the finschia-sdk module.
The task is to check if there is a need to apply a filter and, if necessary, proceed with its implementation.
https://github.com/Finschia/wasmvm/blob/5675e0d83bba669ee367f4cf004f23aeb7c81a3a/types/msg.go#L101