---
id: CVE-2026-18569
title: >-
  Keycloak-services: keycloak-services: oidc backchannel logout accepts unsigned
  forged logout tokens
summary: >-
  A flaw was found in the backchannel logout endpoint of the keycloak-services
  component, which is part of the Red Hat Build of Keycloak. This component
  handles authentication and session management for applications. The issue
  occurs when …
severity: low
cvss: 3.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'
cvssSource: cna
cwe:
  - CWE-347
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-services
  - rhbk-keycloak-rhel9/rhbk-keycloak-rhel9
  - rhbk-openshift-rhel9/rhbk-openshift-rhel9
  - keycloak-services
  - keycloak-services
  - keycloak-services
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-08-04T14:39:44.937144Z'
published: '2026-08-04'
updated: '2026-11-07'
sourceUpdated: '2026-11-07T11:52:17.401Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-18569'
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-2026-18569'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2509755'
    label: RHBZ#2509755
tags:
  - cve.org
epss: 0.0025
epssPercentile: 0.16451
ingestedAt: '2026-11-07T12:16:41.101Z'
---

## Overview

A flaw was found in the backchannel logout endpoint of the keycloak-services component, which is part of the Red Hat Build of Keycloak. This component handles authentication and session management for applications. The issue occurs when an OIDC identity provider is configured to skip signature validation. In this specific setup, the system incorrectly accepts logout requests that have no cryptographic signature. An attacker who knows certain technical details about a user's session can use this flaw to force that user to be logged out, potentially disrupting their work.

## Affected

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