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.

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Fixes

Solution

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Workaround

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.

History

Tue, 04 Aug 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 04 Aug 2026 05:45:00 +0000

Type Values Removed Values Added
Title keycloak-services: keycloak-services: OIDC backchannel logout accepts unsigned forged logout tokens Keycloak-services: keycloak-services: oidc backchannel logout accepts unsigned forged logout tokens
First Time appeared Redhat build Keycloak
Redhat jboss Data Grid
Redhat jbosseapxp
Redhat red Hat Single Sign On
CPEs cpe:/a:redhat:build_keycloak:
cpe:/a:redhat:jboss_data_grid:8
cpe:/a:redhat:jbosseapxp
cpe:/a:redhat:red_hat_single_sign_on:7
Vendors & Products Redhat build Keycloak
Redhat jboss Data Grid
Redhat jbosseapxp
Redhat red Hat Single Sign On
References

Sun, 02 Aug 2026 21:00:00 +0000

Type Values Removed Values Added
First Time appeared Redhat
Redhat keycloak
Vendors & Products Redhat
Redhat keycloak

Sun, 02 Aug 2026 12:15:00 +0000

Type Values Removed Values Added
Description 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.
Title keycloak-services: keycloak-services: OIDC backchannel logout accepts unsigned forged logout tokens
Weaknesses CWE-347
References
Metrics threat_severity

None

cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'}

threat_severity

Low


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-08-04T14:40:25.485Z

Reserved: 2026-08-02T05:15:06.002Z

Link: CVE-2026-18569

cve-icon Vulnrichment

Updated: 2026-08-04T14:40:21.641Z

cve-icon NVD

No data.

cve-icon Redhat

Severity : Low

Publid Date: 2026-07-31T10:18:53Z

Links: CVE-2026-18569 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-08-03T08:45:03Z

Weaknesses