CVE-2026-0871: Red Hat Build Of Keycloak

Medium severity, CVSS 4.9. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Red Hat Build Of Keycloak: before 26.4.9 (fixed in 26.4.9); affected versions not specified
• Red Hat Keycloak: before 26.4.0 (fixed in 26.4.0)

Published 2026-02-27. Last modified 2026-06-17.