HashiCorp Vault Enterprise 1.7.0 through 1.9.7, 1.10.4, and 1.11.0 clusters using Integrated Storage expose an unauthenticated API endpoint that could be abused to override the voter status of a node within a Vault HA cluster, introducing potential for future data loss or catastrophic failure. Fixed in Vault Enterprise 1.9.8, 1.10.5, and 1.11.1.
The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.