CVE-2026-84712 is a vulnerability in the automation-controller API where an unauthenticated health-check endpoint (/api/v2/ping/) over-serializes role-based access control (RBAC) gated automation-mesh data. This exposure reveals detailed instance inventory information including node hostnames, types, UUIDs, heartbeats, capacities, versions, instance-group names and memberships, deployment install UUID, and the active control node. The flaw impacts confidentiality by allowing remote unauthenticated attackers to map the control plane and fingerprint software versions. It does not expose secrets, credentials, or tenant data.