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CVE-2026-16108— Keycloak-services: keycloak-services: realm default-group reads disclose hidden groups under fgap v2

Quick assessment

Affected
Red Hat Red Hat build of Keycloak 26.6
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.

Red Hat build of Keycloak是美国Red Hat公司开源的一款用于单点登录的Web应用。 Red Hat Build of Keycloak存在安全漏洞，该漏洞源于default-groups REST endpoint和realm representation组件问题，可能导致具有realm查看权限的委派管理员查看隐藏默认组的名称和标识符，从而暴露敏感的组织结构或内部组名称。

CVSS 4.3 · Medium EPSS 0.37% · P29

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery

Affected Version Matrix 9

VendorProduct Version RangeStatus
Red Hat Red Hat build of Keycloak 26.6 26.6.7-3< * unaffected
26.6-20< * unaffected
26.6-20< * unaffected
Red Hat Red Hat build of Keycloak 26.6.7 any unaffected
any unaffected
any unaffected
Red Hat Red Hat Data Grid 8 any unaffected
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack any unaffected
Red Hat Red Hat Single Sign-On 7 any unaffected
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I. Basic Information for CVE-2026-16108

Vulnerability Information
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Vulnerability Title
Keycloak-services: keycloak-services: realm default-group reads disclose hidden groups under fgap v2
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the default-groups REST endpoint and realm representation of Keycloak. This component is responsible for managing groups that are automatically assigned to new users within a realm. The issue allows a delegated administrator with realm-viewing permissions to see the names and identifiers of hidden default groups, even if they lack the specific permissions to view those groups. This can lead to the exposure of sensitive organizational structures or internal group names.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1220
Source: CVE Program / CVE List V5
Vulnerability Title
Red Hat Build of Keycloak 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Red Hat build of Keycloak是美国Red Hat公司开源的一款用于单点登录的Web应用。 Red Hat Build of Keycloak存在安全漏洞，该漏洞源于default-groups REST endpoint和realm representation组件问题，可能导致具有realm查看权限的委派管理员查看隐藏默认组的名称和标识符，从而暴露敏感的组织结构或内部组名称。
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 26.6 26.6.7-3 ~ * cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6 26.6-20 ~ * cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6 26.6-20 ~ * cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6.7 - cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6.7 - cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6.7 - cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat Data Grid 8 - cpe:/a:redhat:jboss_data_grid: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-2026-16108

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III. Intelligence Information for CVE-2026-16108

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Vendor Advisories for CVE-2026-16108 (4)

Same Patch Batch · Red Hat · 2026-07-17 · 8 CVEs total

CVE-2026-15943 5.5 MEDIUM Keycloak-services: keycloak-services: oidc idp update reuses masked client secret after to
CVE-2026-16093 5.4 MEDIUM Keycloak-services: keycloak-services: required signed-jwt assertion policy can be bypassed
CVE-2026-16089 5.4 MEDIUM Keycloak-services: keycloak-services: authorization codes can be retargeted to another cli
CVE-2026-16106 4.9 MEDIUM Keycloak-services: keycloak-services: incorrect authorization in admin role-composite dele
CVE-2026-16072 4.9 MEDIUM Keycloak-services: keycloak-services: organization invitation link exposure allows unautho
CVE-2026-16104 4.3 MEDIUM Keycloak-services: keycloak-services: authenticator config endpoint exposes raw recaptcha
CVE-2026-16103 4.3 MEDIUM Keycloak-services: keycloak-services: incomplete fix for ciba brute-force lockout bypass a

IV. Related Vulnerabilities

Same product: Red Hat build of Keycloak 26.6
Same vendor: Red Hat
Same weakness: CWE-1220

V. Comments for CVE-2026-16108

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