{"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","slug":"CVE-2026-18569","body":"## Overview\n\nA 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.\n\n## Affected\n\n- `rhbk/keycloak-operator-bundle (all versions)`\n- `rhbk/keycloak-rhel9 (all versions)`\n- `rhbk/keycloak-rhel9-operator (all versions)`\n- `keycloak-services`\n- `rhbk-keycloak-rhel9/rhbk-keycloak-rhel9`\n- `rhbk-openshift-rhel9/rhbk-openshift-rhel9`\n- `keycloak-services`\n- `keycloak-services`\n- `keycloak-services`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n### Workarounds\n\nMitigation 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.","depth":"sunlit","depthScore":20,"depthScoreParts":{"impact":20.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}