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CVE-2026-3911— Org.keycloak.services.resources.admin.userresource: keycloak: information disclosure of disabled user attributes via administrative endpoint

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UserResource组件存在漏洞，可能导致具有view-users角色的经过身份验证的用户通过访问特定管理端点不当检索配置为隐藏的用户属性，造成敏感数据泄露。

CVSS 2.7 · Low EPSS 0.33% · P26

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2026-3911

Vulnerability Information
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Vulnerability Title
Org.keycloak.services.resources.admin.userresource: keycloak: information disclosure of disabled user attributes via administrative endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in Keycloak. An authenticated user with the view-users role could exploit a vulnerability in the UserResource component. By accessing a specific administrative endpoint, this user could improperly retrieve user attributes that were configured to be hidden. This unauthorized information disclosure could expose sensitive user data.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
侵犯隐私
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UserResource组件存在漏洞，可能导致具有view-users角色的经过身份验证的用户通过访问特定管理端点不当检索配置为隐藏的用户属性，造成敏感数据泄露。
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 26.4.11-1 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4 26.4-14 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4 26.4-14 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4.11 - cpe:/a:redhat:build_keycloak:26.4::el9

II. Public POCs for CVE-2026-3911

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III. Intelligence Information for CVE-2026-3911

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Vendor Advisories for CVE-2026-3911 (4)

IV. Related Vulnerabilities

Same product: Red Hat build of Keycloak 26.4
Same vendor: Red Hat
Same weakness: CWE-359

V. Comments for CVE-2026-3911

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