---
id: CVE-2026-92857
title: >-
  Keycloak-services: keycloak-services: dcr protocol mapper config not
  validated, allowing iat holders to forge sub and aud claims in signed tokens
summary: >-
  Keycloak provides a Dynamic Client Registration feature that allows users with
  specific tokens to register their own applications. A flaw in how Keycloak
  validates these registration requests allows an attacker to create a malicious
  appl…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'
cvssSource: cna
cwe:
  - CWE-20
vendor: Red Hat
product: keycloak/rhbk-openshift-rhel9
affected:
  - keycloak/rhbk-openshift-rhel9 (all versions)
  - keycloak-services (all versions)
  - rhbk/keycloak-rhel9 (all versions)
  - keycloak-services
published: '2026-11-05'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T17:15:24.374Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-92857'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-92857'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2535817'
    label: RHBZ#2535817
tags:
  - cve.org
ingestedAt: '2026-11-05T22:38:31.430Z'
---

## Overview

Keycloak provides a Dynamic Client Registration feature that allows users with specific tokens to register their own applications. A flaw in how Keycloak validates these registration requests allows an attacker to create a malicious application that forges identity information. By mapping their own user profile details to protected fields like the user ID (sub) or intended audience (aud), an attacker can generate signed security tokens that make them appear to be a different user. This could allow an attacker to impersonate other users or gain unauthorized access to services that rely on these tokens for identity verification.

## Affected

- `keycloak/rhbk-openshift-rhel9 (all versions)`
- `keycloak-services (all versions)`
- `rhbk/keycloak-rhel9 (all versions)`
- `keycloak-services`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

### Workarounds

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.