CVE-2026-16102
Keycloak-services: keycloak-services: default dcr policy allows role forgery via user property mappers
CVSS Score
8.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | red hat |
| Product | red hat build of keycloak 26.4 |
| Published | Aug 5, 2026 |
| Last Updated | Aug 5, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
Red Hat / Red Hat build of Keycloak 26.4
All versions affected Red Hat / Red Hat build of Keycloak 26.4
All versions affected Red Hat / Red Hat build of Keycloak 26.4
All versions affected Red Hat / Red Hat build of Keycloak 26.4.14
All versions affected Red Hat / Red Hat build of Keycloak 26.4.14
All versions affected Red Hat / Red Hat build of Keycloak 26.6
All versions affected Red Hat / Red Hat build of Keycloak 26.6
All versions affected Red Hat / Red Hat build of Keycloak 26.6
All versions affected Red Hat / Red Hat build of Keycloak 26.6.5
All versions affected Red Hat / Red Hat build of Keycloak 26.6.5
All versions affected Red Hat / Red Hat build of Keycloak 26.6.5
All versions affected Red Hat / Red Hat Data Grid 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform Expansion Pack
All versions affected Red Hat / Red Hat Single Sign-On 7
All versions affected References
access.redhat.com: https://access.redhat.com/errata/RHSA-2026:50846 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:50847 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:50848 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:50849 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-16102 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2501735
Credits
Red Hat would like to thank yd1ng for reporting this issue.