Keycloak Admin REST API Privilege Escalation via Realm Validation Bypass
CVE-2026-94215 Published on September 21, 2026
Keycloak-services: keycloak-services: cross-realm client read/write via request-level cache missing realm ownership check
A flaw was found in the Admin REST API of Keycloak, an open-source identity and access management solution. The issue occurs because the API uses a per-request in-memory cache to resolve clients by their unique identifier without verifying if the client belongs to the realm specified in the request path. This allows an administrator with limited privileges to read or modify sensitive client configurations in the master realm by accessing them through a realm they control. Successful exploitation could lead to the exposure of client credentials or the redirection of administrative login attempts to malicious sites.
Vulnerability Analysis
CVE-2026-94215 can be exploited with network access, and requires user privileges. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality, a high impact on integrity, and a small impact on availability.
Timeline
Reported to Red Hat.
Made public.
Weakness Type
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-2026-94215 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2026-94215
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