Is CVE-2026-16105 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-16105?

CVE-2026-16105 has a CVSS v3 severity of MEDIUM (4.9).

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CVE-2026-16105

Description

A flaw was found in the RoleContainerResource component of Keycloak. The issue occurs because certain name-based endpoints in the admin REST API do not properly enforce authorization checks when managing composite roles. This allows a delegated administrator with manage-realm permissions to remove essential child roles from built-in admin roles, potentially disrupting administrative functions within a realm.