Keycloak RBAC Bypass: Unauthorized Attribute Modification via manageusers
CVE-2026-0871 Published on February 27, 2026
Org.keycloak/keycloak-services: keycloak: unauthorized modification of unmanaged user attributes by administrators
A flaw was found in Keycloak. An administrator with `manage-users` permission can bypass the "Only administrators can view" setting for unmanaged attributes, allowing them to modify these attributes. This improper access control can lead to unauthorized changes to user profiles, even when the system is configured to restrict such modifications.
Vulnerability Analysis
CVE-2026-0871 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 Type
Incorrect Privilege Assignment
A product incorrectly assigns a privilege to a particular actor, creating an unintended sphere of control for that actor.
Products Associated with CVE-2026-0871
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Affected Versions
Red Hat build of Keycloak 26.4:- Version 26.4.9-1 and below * is unaffected.
- Version 26.4-11 and below * is unaffected.
- Version 26.4-10 and below * is unaffected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.