CVE-2026-0871

low-risk

Published 2026-02-27

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.

Do I need to act?

0.03% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 4.9/10 Medium

NETWORK / LOW complexity

Affected Products (3)

Build Of Keycloak

Keycloak

Affected Vendors

Redhat

References (4)

Vendor Advisory https://access.redhat.com/errata/RHSA-2026:2365

Vendor Advisory https://access.redhat.com/errata/RHSA-2026:2366

Vendor Advisory https://access.redhat.com/security/cve/CVE-2026-0871

Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=2428881

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low-risk

Severity 20/34 · Moderate

Exploitability 0/34 · Minimal

Exposure 9/34 · Low