CVE-2026-9794
Full vulnerability record from the local CVENow database.
Description
A flaw was found in Keycloak. A remote, unauthenticated attacker can exploit this vulnerability by sending specially crafted SOAP requests to the SAML ECP (Security Assertion Markup Language Enhanced Client or Proxy) endpoint with varying client IDs. By observing distinct faultstrings in the responses, the attacker can determine the client's protocol type, leading to information disclosure.
Severity
MEDIUM
CVSS score
5.3
(v3.1)
Vulnerability status
Modified
Source identifier
Published
2026-05-28 05:16:40.847000
Last modified
2026-10-26 12:10:00.130000
View original CVE JSON
{
"id": "CVE-2026-9794",
"sourceIdentifier": "[email protected]",
"published": "2026-05-28T05:16:40.847",
"lastModified": "2026-10-26T12:10:00.130",
"vulnStatus": "Modified",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "A flaw was found in Keycloak. A remote, unauthenticated attacker can exploit this vulnerability by sending specially crafted SOAP requests to the SAML ECP (Security Assertion Markup Language Enhanced Client or Proxy) endpoint with varying client IDs. By observing distinct faultstrings in the responses, the attacker can determine the client's protocol type, leading to information disclosure."
},
{
"lang": "es",
"value": "Se encontró un fallo en Keycloak. Un atacante remoto no autenticado puede explotar esta vulnerabilidad enviando solicitudes SOAP especialmente diseñadas al endpoint SAML ECP (Security Assertion Markup Language Enhanced Client or Proxy) con IDs de cliente variables. Al observar faultstrings distintos en las respuestas, el atacante puede determinar el tipo de protocolo del cliente, lo que lleva a la revelación de información."
}
],
"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"
],
"versions": [
{
"version": "26.4.13-1",
"lessThan": "*",
"versionType": "rpm",
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}
]
},
{
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{
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"packageName": "rhbk/keycloak-operator-bundle",
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},
{
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},
{
"vendor": "Red Hat",
"product": "Red Hat build of Keycloak 26.6.3",
"defaultStatus": "unaffected",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "rhbk/keycloak-rhel9",
"cpes": [
"cpe:/a:redhat:build_keycloak:26.6::el9"
]
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}
],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"availabilityImpact": "NONE"
},
"exploitabilityScore": 3.9,
"impactScore": 1.4
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-05-28T13:00:49.126374Z",
"id": "CVE-2026-9794",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-209"
}
]
}
],
"configurations": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
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],
"references": [
{
"url": "https://access.redhat.com/errata/RHSA-2026:25097",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:25098",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:30049",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:30050",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/security/cve/CVE-2026-9794",
"source": "[email protected]",
"tags": [
"Vendor Advisory"
]
},
{
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482461",
"source": "[email protected]",
"tags": [
"Issue Tracking",
"Vendor Advisory"
]
}
]
}