CVE-2026-9689
Full vulnerability record from the local CVENow database.
Description
A flaw was found in Keycloak, an open-source identity and access management solution. When a client application is configured to accept broad redirect Uniform Resource Identifiers (URIs), a remote attacker can manipulate the authentication process by crafting a special web address. If a user clicks this link, the client application might incorrectly prioritize attacker-controlled information over legitimate data. This vulnerability, known as HTTP parameter pollution, could allow an attacker to bypass security measures or gain unauthorized access to resources.
Severity
MEDIUM
CVSS score
4.2
(v3.1)
Vulnerability status
Modified
Source identifier
Published
2026-05-27 12:17:15.513000
Last modified
2026-10-26 11:10:00.157000
View original CVE JSON
{
"id": "CVE-2026-9689",
"sourceIdentifier": "[email protected]",
"published": "2026-05-27T12:17:15.513",
"lastModified": "2026-10-26T11:10:00.157",
"vulnStatus": "Modified",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "A flaw was found in Keycloak, an open-source identity and access management solution. When a client application is configured to accept broad redirect Uniform Resource Identifiers (URIs), a remote attacker can manipulate the authentication process by crafting a special web address. If a user clicks this link, the client application might incorrectly prioritize attacker-controlled information over legitimate data. This vulnerability, known as HTTP parameter pollution, could allow an attacker to bypass security measures or gain unauthorized access to resources."
},
{
"lang": "es",
"value": "Se encontró una falla en Keycloak, una solución de gestión de identidad y acceso de código abierto. Cuando una aplicación cliente está configurada para aceptar identificadores uniformes de recursos (URI) de redirección amplios, un atacante remoto puede manipular el proceso de autenticación al crear una dirección web especial. Si un usuario hace clic en este enlace, la aplicación cliente podría priorizar incorrectamente la información controlada por el atacante sobre los datos legítimos. Esta vulnerabilidad, conocida como contaminación de parámetros HTTP, podría permitir a un atacante eludir las medidas de seguridad o obtener acceso no autorizado a recursos."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
"vendor": "Red Hat",
"product": "Red Hat build of Keycloak 26.4",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "rhbk/keycloak-operator-bundle",
"cpes": [
"cpe:/a:redhat:build_keycloak:26.4::el9"
],
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{
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"lessThan": "*",
"versionType": "rpm",
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}
]
},
{
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},
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"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "rhbk/keycloak-rhel9",
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},
{
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"packageName": "rhbk/keycloak-operator-bundle",
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},
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},
{
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"packageName": "rhbk/keycloak-rhel9-operator",
"cpes": [
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],
"versions": [
{
"version": "26.6-11",
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},
{
"vendor": "Red Hat",
"product": "Red Hat build of Keycloak 26.6.5",
"defaultStatus": "unaffected",
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"cpes": [
"cpe:/a:redhat:build_keycloak:26.6::el9"
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N",
"baseScore": 4.2,
"baseSeverity": "MEDIUM",
"attackVector": "NETWORK",
"attackComplexity": "HIGH",
"privilegesRequired": "NONE",
"userInteraction": "REQUIRED",
"scope": "UNCHANGED",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"availabilityImpact": "NONE"
},
"exploitabilityScore": 1.6,
"impactScore": 2.5
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-05-27T14:45:36.377913Z",
"id": "CVE-2026-9689",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
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{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-1288"
}
]
}
],
"configurations": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
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],
"references": [
{
"url": "https://access.redhat.com/errata/RHSA-2026:50846",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:50847",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:50848",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:50849",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/security/cve/CVE-2026-9689",
"source": "[email protected]",
"tags": [
"Vendor Advisory"
]
},
{
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2481845",
"source": "[email protected]",
"tags": [
"Issue Tracking",
"Vendor Advisory"
]
}
]
}