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

CVSS 4.3 · Medium EPSS 0.18% · P8

Possible ATT&CK Techniques 1AI

T1083 · File and Directory Discovery

Affected Version Matrix 6

VendorProductVersion RangeStatus
Red HatRed Hat Build of Keycloakanyaffected
anyaffected
anyaffected
Red HatRed Hat Data Grid 8anyunaffected
Red HatRed Hat JBoss Enterprise Application Platform Expansion Packanyunaffected
Red HatRed Hat Single Sign-On 7anyunaffected
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
Red HatRed Hat Build of Keycloak-cpe:/a:redhat:build_keycloak:
Red HatRed Hat Build of Keycloak-cpe:/a:redhat:build_keycloak:
Red HatRed Hat Build of Keycloak-cpe:/a:redhat:build_keycloak:
Red HatRed Hat Data Grid 8-cpe:/a:redhat:jboss_data_grid:8
Red HatRed Hat JBoss Enterprise Application Platform Expansion Pack-cpe:/a:redhat:jbosseapxp
Red HatRed 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 (1)

Other References for CVE-2026-16108 (1)

Same Patch Batch · Red Hat · 2026-07-17 · 9 CVEs total

CVE-2026-161187.1 HIGHXdgmime: heap-based buffer overflow in _xdg_mime_magic_parse_magic_line() in xdgmimemagic.
CVE-2026-159435.5 MEDIUMKeycloak-services: keycloak-services: oidc idp update reuses masked client secret after to
CVE-2026-160935.4 MEDIUMKeycloak-services: keycloak-services: required signed-jwt assertion policy can be bypassed
CVE-2026-160895.4 MEDIUMKeycloak-services: keycloak-services: authorization codes can be retargeted to another cli
CVE-2026-161064.9 MEDIUMKeycloak-services: keycloak-services: incorrect authorization in admin role-composite dele
CVE-2026-160724.9 MEDIUMKeycloak-services: keycloak-services: organization invitation link exposure allows unautho
CVE-2026-161044.3 MEDIUMKeycloak-services: keycloak-services: authenticator config endpoint exposes raw recaptcha
CVE-2026-161034.3 MEDIUMKeycloak-services: keycloak-services: incomplete fix for ciba brute-force lockout bypass a

IV. Related Vulnerabilities

Same product: Red Hat Build of Keycloak
Same vendor: Red Hat

V. Comments for CVE-2026-16108

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