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3.7 Low

CVE-2026-18569 Keycloak-services: keycloak-services: oidc backchannel logout accepts unsigned forged logout tokens

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.

CVSS 3.1 detail

Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

Exploitable remotely over the network, without an account and without any user action; the impact on data or service is limited.

Attack vector
Network
Attack complexity
High
Privileges required
None
Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

Affected products and versions

Product Affected versions Fixed in
Red Hat Build of Keycloak Versions not published
Red Hat Data Grid 8 Versions not published
Red Hat JBoss Enterprise Application Platform Expansion Pack Versions not published
Red Hat Single Sign-On 7 Versions not published
Red Hat build of Keycloak 26.6 26.6 earliest → < 26.6-24 26.6-24
Red Hat build of Keycloak 26.6.8 Versions not published

Other CVEs of Red Hat Build of Keycloak

The 277 CVEs of Red Hat Build of Keycloak →
CVE-2026-120984 Keycloak-services: keycloak-services: manage-clients to arbitrary code execution through inline javascript policy import 9.1 Critical CVE-2026-9797 Keycloak: keycloak: privilege escalation via client authentication manipulation by an authenticated administrator 6.5 Medium CVE-2026-97848 Keycloak-services: keycloak-services: protocol mapper with jsontype=json bypasses token sanitization 6.5 Medium CVE-2026-97367 Keycloak-services: keycloak-services: dcr azp and sid claim substitution allows account rest session takeover 6.4 Medium
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