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

published 2026-02-27 8 mo ago modified 2026-09-08 2 mo ago also BIT-keycloak-2026-0871 , EUVD-2026-9005 , GHSA-v4jw-m6rm-399h

cvss: 4.9; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 28%
public exploits: 0; none known

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.

Patch / fix

fixed in 3 links 1

maven org.keycloak:keycloak-server-spi-private 26.5.2
bitnami keycloak 26.4.9
Red Hat Red Hat build of Keycloak 26.4 26.4-10, 26.4-11, 26.4.9-1

github.com/keycloak/keycloak@9d0f679 commit

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-0871 updated 2026-08-04 cvss 4.9

org.keycloak/keycloak-services: Keycloak: Unauthorized modification of unmanaged user attributes by administrators

Red Hat JBoss Enterprise Application Platform 8 keycloak-services Red Hat JBoss Enterprise Application Platform Expansion Pack keycloak-services Red Hat Single Sign-On 7 keycloak-services
affected: workaround, no fix available “Fix deferred”
Red Hat build of Keycloak 26.4 rhbk/keycloak-rhel9 26.4-11, rhbk/keycloak-rhel9-operator 26.4-10, rhbk/keycloak-operator-bundle 26.4.9-1
fixed: vendor fix RHSA-2026:2366
Red Hat build of Keycloak 26.4.9
fixed: vendor fix RHSA-2026:2365

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 8 mo ago (2026-02-27)

Exploit prediction

0.35% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	4.9	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
GitHub	3.1	4.9	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
OSV	3.1	4.9	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem	package	affected	fixed in
maven	org.keycloak:keycloak-server-spi-private	<26.5.2	26.5.2
bitnami	keycloak	<26.4.9	26.4.9

Affected products

Red Hat Red Hat build of Keycloak 26.4
Red Hat Red Hat build of Keycloak 26.4.9
Red Hat Red Hat JBoss Enterprise Application Platform 8
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack
Red Hat Red Hat Single Sign-On 7

Classification

Weakness

CWE-266 Incorrect Privilege Assignment
CWE-284 Improper Access Control

References

github.com /keycloak/keycloak/commit/9d0f679ecea405958f167fcd0f4a6db6ae32c3fa
web
access.redhat.com /errata/RHSA-2026:2365
vendor-advisory, web, advisory
access.redhat.com /errata/RHSA-2026:2366
vendor-advisory, web, advisory
access.redhat.com /security/cve/CVE-2026-0871
vdb-entry, web, vendor-advisory, advisory
bugzilla.redhat.com /show_bug.cgi?id=2428881
issue-tracking, web, vendor-advisory, advisory
nvd.nist.gov /vuln/detail/CVE-2026-0871
advisory, web
github.com /keycloak/keycloak/issues/45873
web
github.com /keycloak/keycloak
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary