CVE-2026-0871
Received Received - Intake

Improper Access Control in Keycloak Allows Unauthorized User Attribute Modification

Publication date: 2026-02-27

Last updated on: 2026-03-05

Assigner: Red Hat, Inc.

Description
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.

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Meta Information

Published
2026-02-27
Last Modified
2026-03-05
Generated
2026-07-06
AI Q&A
2026-02-27
EPSS Evaluated
2026-07-05
NVD
CVE-2026-0871
EUVD
EUVD-2026-9005

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
redhat build_of_keycloak *
redhat build_of_keycloak to 26.4.9 (exc)
redhat keycloak to 26.4.0 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-266 A product incorrectly assigns a privilege to a particular actor, creating an unintended sphere of control for that actor.

Attack-Flow Graph

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Executive Summary

This vulnerability exists in Keycloak where an administrator who has the 'manage-users' permission can bypass the 'Only administrators can view' setting for unmanaged attributes. This means that such an administrator can modify these unmanaged attributes even if the system is configured to restrict modifications to them.

The root cause is improper access control, allowing unauthorized changes to user profiles.

Impact Analysis

The impact of this vulnerability is that an administrator with certain permissions can make unauthorized changes to user profiles by modifying unmanaged attributes that should be restricted.

While this does not affect confidentiality or availability, it can lead to integrity issues since unauthorized modifications can occur.

Compliance Impact

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Detection Guidance

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