---
id: CVE-2026-92856
title: >-
  Keycloak-services: keycloak-services: saml broker ignores proxyrestriction
  delegation constraints
summary: >-
  A flaw was found in the SAML brokering component of Keycloak, an identity and
  access management solution. The issue occurs when Keycloak acts as an
  intermediary between an upstream identity provider and downstream services.
  Keycloak fail…
severity: medium
cvss: 4.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-862
vendor: Red Hat
product: rhbk/keycloak-operator-bundle
affected:
  - rhbk/keycloak-operator-bundle (all versions)
  - rhbk/keycloak-rhel9 (all versions)
  - rhbk/keycloak-rhel9-operator (all versions)
  - keycloak/rhbk-openshift-rhel9
  - keycloak-services
  - rhbk/keycloak-rhel9
  - keycloak-services (all versions)
published: '2026-11-06'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T17:34:21.233Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-92856'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:95761'
    label: 'RHSA-2026:95761'
  - url: 'https://access.redhat.com/errata/RHSA-2026:95762'
    label: 'RHSA-2026:95762'
  - url: 'https://access.redhat.com/security/cve/CVE-2026-92856'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2535815'
    label: RHBZ#2535815
tags:
  - cve.org
epss: 0.00246
epssPercentile: 0.15936
ingestedAt: '2026-11-06T06:46:27.267Z'
---

## Overview

A flaw was found in the SAML brokering component of Keycloak, an identity and access management solution. The issue occurs when Keycloak acts as an intermediary between an upstream identity provider and downstream services. Keycloak fails to respect specific security instructions called ProxyRestrictions in the login messages it receives. This allows a user to log into downstream services even when the original identity provider explicitly forbade further sharing of the login session. As a result, users can bypass security boundaries intended to limit where their identity can be used.

## Affected

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

## 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.