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CVE-2026-0871— Org.keycloak/keycloak-services: keycloak: unauthorized modification of unmanaged user attributes by administrators

Quick assessment

Affected
Red Hat Red Hat build of Keycloak 26.4
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Keycloak是Keycloak开源的一种开源身份和访问管理解决方案。 Keycloak存在安全漏洞，该漏洞源于访问控制不当，可能导致具有manage-users权限的管理员绕过设置并修改非托管属性。

CVSS 4.9 · Medium EPSS 0.32% · P23

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2026-0871

Vulnerability Information
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Vulnerability Title
Org.keycloak/keycloak-services: keycloak: unauthorized modification of unmanaged user attributes by administrators
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
特权授予不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Keycloak 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Keycloak是Keycloak开源的一种开源身份和访问管理解决方案。 Keycloak存在安全漏洞，该漏洞源于访问控制不当，可能导致具有manage-users权限的管理员绕过设置并修改非托管属性。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat build of Keycloak 26.4 26.4.9-1 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4 26.4-11 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4 26.4-10 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4.9 - cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat JBoss Enterprise Application Platform 8 - cpe:/a:redhat:jboss_enterprise_application_platform:8
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack - cpe:/a:redhat:jbosseapxp
Red Hat Red Hat Single Sign-On 7 - cpe:/a:redhat:red_hat_single_sign_on:7

II. Public POCs for CVE-2026-0871

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III. Intelligence Information for CVE-2026-0871

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Same Patch Batch · Red Hat · 2026-02-27 · 5 CVEs total

CVE-2026-0980 8.3 HIGH Rubyipmi: red hat satellite: remote code execution in rubyipmi via malicious bmc username
CVE-2025-9909 6.7 MEDIUM Aap-gateway: improper path validation in gateway allows credential exfiltration
CVE-2025-9908 6.7 MEDIUM Event-driven-ansible: sensitive internal headers disclosure in aap eda event streams
CVE-2025-9907 6.7 MEDIUM Event-driven-ansible: event stream test mode exposes sensitive headers in aap eda

IV. Related Vulnerabilities

Same product: Red Hat build of Keycloak 26.4
Same vendor: Red Hat
Same weakness: CWE-266

V. Comments for CVE-2026-0871

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