CVE-2026-9802
Full vulnerability record from the local CVENow database.
Description
A flaw was found in Keycloak. When revokeRefreshToken=true is enabled and persistent session storage is in use, a server restart can reset internal timing mechanisms. This allows a remote attacker, who has previously captured a user's refresh token, to replay that token even after it has been revoked. Successful exploitation grants the attacker unauthorized access to the victim's account, potentially leading to information disclosure or privilege escalation.
Severity
MEDIUM
CVSS score
6.8
(v3.1)
Vulnerability status
Modified
Source identifier
Published
2026-05-28 06:16:29.620000
Last modified
2026-10-26 12:10:00.130000
View original CVE JSON
{
"id": "CVE-2026-9802",
"sourceIdentifier": "[email protected]",
"published": "2026-05-28T06:16:29.620",
"lastModified": "2026-10-26T12:10:00.130",
"vulnStatus": "Modified",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "A flaw was found in Keycloak. When revokeRefreshToken=true is enabled and persistent session storage is in use, a server restart can reset internal timing mechanisms. This allows a remote attacker, who has previously captured a user's refresh token, to replay that token even after it has been revoked. Successful exploitation grants the attacker unauthorized access to the victim's account, potentially leading to information disclosure or privilege escalation."
},
{
"lang": "es",
"value": "Se encontró una vulnerabilidad en Keycloak. Cuando revokeRefreshToken=true está habilitado y el almacenamiento persistente de sesiones está en uso, un reinicio del servidor puede restablecer los mecanismos internos de temporización. Esto permite a un atacante remoto, que ha capturado previamente el token de actualización de un usuario, reutilizar ese token incluso después de haber sido revocado. La explotación exitosa otorga al atacante acceso no autorizado a la cuenta de la víctima, lo que podría conducir a la revelación de información o a la escalada de privilegios."
}
],
"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",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat build of Keycloak 26.4",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "rhbk/keycloak-rhel9",
"cpes": [
"cpe:/a:redhat:build_keycloak:26.4::el9"
],
"versions": [
{
"version": "26.4-19",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat build of Keycloak 26.4",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "rhbk/keycloak-rhel9-operator",
"cpes": [
"cpe:/a:redhat:build_keycloak:26.4::el9"
],
"versions": [
{
"version": "26.4-19",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat build of Keycloak 26.4.13",
"defaultStatus": "unaffected",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "rhbk/keycloak-rhel9",
"cpes": [
"cpe:/a:redhat:build_keycloak:26.4::el9"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat build of Keycloak 26.6",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "rhbk/keycloak-operator-bundle",
"cpes": [
"cpe:/a:redhat:build_keycloak:26.6::el9"
],
"versions": [
{
"version": "26.6.3-3",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat build of Keycloak 26.6",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "rhbk/keycloak-rhel9",
"cpes": [
"cpe:/a:redhat:build_keycloak:26.6::el9"
],
"versions": [
{
"version": "26.6-6",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"vendor": "Red Hat",
"product": "Red Hat build of Keycloak 26.6",
"defaultStatus": "affected",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "rhbk/keycloak-rhel9-operator",
"cpes": [
"cpe:/a:redhat:build_keycloak:26.6::el9"
],
"versions": [
{
"version": "26.6-6",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
]
},
{
"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"
]
}
]
}
],
"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:H/I:H/A:N",
"baseScore": 6.8,
"baseSeverity": "MEDIUM",
"attackVector": "NETWORK",
"attackComplexity": "HIGH",
"privilegesRequired": "NONE",
"userInteraction": "REQUIRED",
"scope": "UNCHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"availabilityImpact": "NONE"
},
"exploitabilityScore": 1.6,
"impactScore": 5.2
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-05-28T13:00:17.958549Z",
"id": "CVE-2026-9802",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-613"
}
]
}
],
"configurations": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:a:redhat:build_of_keycloak:-:*:*:*:-:*:*:*",
"matchCriteriaId": "E5C930CB-4EAD-497B-A44B-D880F2A1F85B"
}
]
}
]
}
],
"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-2026-9802",
"source": "[email protected]",
"tags": [
"Vendor Advisory"
]
},
{
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482467",
"source": "[email protected]",
"tags": [
"Issue Tracking",
"Vendor Advisory"
]
}
]
}