Copyright © 2012 Red Hat, Inc. All rights reserved. Important 2026-08-05T02:02:00 keycloak-services: keycloak-services: Default DCR policy allows role forgery via User Property mappers 8.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

A flaw was found in the Dynamic Client Registration (DCR) component of Keycloak, an identity and access management solution. The default DCR policy fails to properly validate the claim path for User Property mappers, allowing them to write values to sensitive internal claim locations. An attacker with a standard user account and a limited Initial Access Token can exploit this to forge administrative roles in their access token. This allows the attacker to take over other clients, steal confidential secrets, and potentially gain full administrative control over the realm.

A flaw was found in the Dynamic Client Registration (DCR) component of Keycloak, an identity and access management solution. The default DCR policy fails to properly validate the claim path for User Property mappers, allowing them to write values to sensitive internal claim locations. An attacker with a standard user account and a limited Initial Access Token can exploit this to forge administrative roles in their access token. This allows the attacker to take over other clients, steal confidential secrets, and potentially gain full administrative control over the realm.

The Red Hat Product Security team has assessed the severity of this vulnerability as Important, given that it allows for significant privilege escalation and full realm compromise. Successful exploitation allows an attacker to read confidential client secrets, modify security configurations, and impersonate administrative service accounts. The vulnerability's root cause is a lack of claim path validation in the default Dynamic Client Registration (DCR) mapper policy. Red Hat would like to thank yd1ng for reporting this issue. Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. Red Hat build of Keycloak 26.4 2026-08-05T00:00:00Z RHSA-2026:50847 rhbk/keycloak-operator-bundle:26.4.14-1 Red Hat build of Keycloak 26.4 2026-08-05T00:00:00Z RHSA-2026:50847 rhbk/keycloak-rhel9:26.4-22 Red Hat build of Keycloak 26.4 2026-08-05T00:00:00Z RHSA-2026:50847 rhbk/keycloak-rhel9-operator:26.4-22 Red Hat build of Keycloak 26.4.14 2026-08-05T00:00:00Z RHSA-2026:50846 keycloak-services Red Hat build of Keycloak 26.4.14 2026-08-05T00:00:00Z RHSA-2026:50846 rhbk-openshift-rhel9/rhbk-openshift-rhel9 Red Hat build of Keycloak 26.6 2026-08-05T00:00:00Z RHSA-2026:50849 rhbk/keycloak-operator-bundle:26.6.5-1 Red Hat build of Keycloak 26.6 2026-08-05T00:00:00Z RHSA-2026:50849 rhbk/keycloak-rhel9:26.6-11 Red Hat build of Keycloak 26.6 2026-08-05T00:00:00Z RHSA-2026:50849 rhbk/keycloak-rhel9-operator:26.6-11 Red Hat build of Keycloak 26.6.5 2026-08-05T00:00:00Z RHSA-2026:50848 keycloak-services Red Hat build of Keycloak 26.6.5 2026-08-05T00:00:00Z RHSA-2026:50848 rhbk-keycloak-rhel9/rhbk-keycloak-rhel9 Red Hat build of Keycloak 26.6.5 2026-08-05T00:00:00Z RHSA-2026:50848 rhbk-openshift-rhel9/rhbk-openshift-rhel9 Red Hat Data Grid 8 Affected keycloak-services Red Hat JBoss Enterprise Application Platform Expansion Pack Affected keycloak-services Red Hat Single Sign-On 7 Affected keycloak-services https://www.cve.org/CVERecord?id=CVE-2026-16102 https://nvd.nist.gov/vuln/detail/CVE-2026-16102