AWS - MSK Privesc

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MSK

For more information about MSK (Kafka) check:

AWS - MSK Enum

msk:ListClusters, msk:UpdateSecurity

With these privileges and access to the VPC where the kafka brokers are, you could add the None authentication to access them.

aws msk --client-authentication <value> --cluster-arn <value> --current-version <value>

You need access to the VPC because you cannot enable None authentication with Kafka publicly exposed. If it's publicly exposed, if SASL/SCRAM authentication is used, you could read the secret to access (you will need additional privileges to read the secret).
If IAM role-based authentication is used and kafka is publicly exposed you could still abuse these privileges to give you permissions to access it.