CVE-2026-18569
Full vulnerability record from the local CVENow database.
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.
Severity
LOW
CVSS score
3.7
(v3.1)
Vulnerability status
Modified
Source identifier
Published
2026-08-04 06:16:30.140000
Last modified
2026-11-07 12:17:46.403000
View original CVE JSON
{
"id": "CVE-2026-18569",
"sourceIdentifier": "[email protected]",
"published": "2026-08-04T06:16:30.140",
"lastModified": "2026-11-07T12:17:46.403",
"vulnStatus": "Modified",
"cveTags": [],
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}
],
"affected": [
{
"source": "[email protected]",
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{
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],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
"baseScore": 3.7,
"baseSeverity": "LOW",
"attackVector": "NETWORK",
"attackComplexity": "HIGH",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "LOW"
},
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"impactScore": 1.4
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"ssvcV203": [
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],
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},
"weaknesses": [
{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-347"
}
]
}
],
"configurations": [
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"references": [
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"url": "https://access.redhat.com/errata/RHSA-2026:95761",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:95762",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/security/cve/CVE-2026-18569",
"source": "[email protected]",
"tags": [
"Vendor Advisory"
]
},
{
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2509755",
"source": "[email protected]",
"tags": [
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"Vendor Advisory"
]
}
]
}