CVE-2026-0871

Org.keycloak/keycloak-services: keycloak: unauthorized modification of unmanaged user attributes by administrators

MEDIUM
4.9
CVSS Score
Published: February 27, 2026 at 07:30 AM UTC
Updated: June 17, 2026 at 10:11 AM UTC
5 products affected across 2 vendorsBuild of KeycloakKeycloakJBoss Enterprise Application Platform

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Severity
MEDIUM4.9
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 26.4.0
v < 26.4.9
Vendor states this is fixed in 26.4-10 (unaffected)
Vendor states this is fixed in 26.4-11 (unaffected)
Vendor states this is fixed in 26.4.9 (unaffected)
Vendor states this is fixed in 26.4.9-1 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (4)

Vendor Advisoryx_refsource_REDHAT
Source: cverecord
https://access.redhat.com/errata/RHSA-2026:2365
Vendor Advisoryx_refsource_REDHAT
Source: cverecord
https://access.redhat.com/errata/RHSA-2026:2366
VDB Entryx_refsource_REDHATVendor Advisory
Source: cverecord
https://access.redhat.com/security/cve/CVE-2026-0871
Issue Trackingx_refsource_REDHATVendor Advisory
Source: cverecord
https://bugzilla.redhat.com/show_bug.cgi?id=2428881

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.9MEDIUMredhat
Attack Vector
NETWORK
Complexity
LOW
Privileges
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-266NVD-CWE-noinfo

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