Keycloak RoleContainerResource Authorization Bypass in Admin REST API
CVE-2026-16105 Published on July 31, 2026
Keycloak-services: keycloak-services: missing per-role authorization on rolecontainerresource composite endpoints
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.
Vulnerability Analysis
CVE-2026-16105 can be exploited with network access, and requires user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, a high impact on integrity, and no impact on availability.
Timeline
Reported to Red Hat.
Made public.
Weakness Types
What is an Insecure Direct Object Reference / IDOR Vulnerability?
The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.
CVE-2026-16105 has been classified to as an Insecure Direct Object Reference / IDOR vulnerability or weakness.
What is an AuthZ Vulnerability?
The software does not perform an authorization check when an actor attempts to access a resource or perform an action.
CVE-2026-16105 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2026-16105
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