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Vulnerabilities CVE-2026-18569

CVE-2026-18569

Low
Open
TLP:CLEAR

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

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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.

Details

CVSS Score
3.7
EPSS Score
0.16%

5.7th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Confidence
90%
Published
Aug 4, 2026
Last Modified
Aug 4, 2026
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