FKIE_CVE-2026-9793

Vulnerability from fkie_nvd - Published: 2026-05-28 05:16 - Updated: 2026-10-26 12:10
Severity
5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Summary
A flaw was found in Keycloak. When a JSON Web Encryption (JWE) encrypted request object is submitted, Keycloak may incorrectly process unsigned claims if the decrypted content is raw JSON, bypassing the configured signature policy. This allows a remote attacker to submit unauthorized claims, leading to a compromise of data integrity within the OpenID Connect (OIDC) authorization flow. While a redirect URI allowlist acts as a compensating control, this vulnerability violates OIDC Core and Financial-grade API (FAPI) signing requirements.
References
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:50846
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:50847
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:50848
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:50849
secalert@redhat.comhttps://access.redhat.com/security/cve/CVE-2026-9793Vendor Advisory
secalert@redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=2482460Issue Tracking, Vendor Advisory
Impacted products
Vendor Product Version
redhat build_of_keycloak -
To clipboard 

{
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          "product": "Red Hat build of Keycloak 26.4",
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              "status": "unaffected",
              "version": "26.4-22",
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          "product": "Red Hat build of Keycloak 26.4.14",
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          "product": "Red Hat build of Keycloak 26.6",
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          "product": "Red Hat build of Keycloak 26.6.5",
          "vendor": "Red Hat"
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    }
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  "configurations": [
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      "nodes": [
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          "negate": false,
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A flaw was found in Keycloak. When a JSON Web Encryption (JWE) encrypted request object is submitted, Keycloak may incorrectly process unsigned claims if the decrypted content is raw JSON, bypassing the configured signature policy. This allows a remote attacker to submit unauthorized claims, leading to a compromise of data integrity within the OpenID Connect (OIDC) authorization flow. While a redirect URI allowlist acts as a compensating control, this vulnerability violates OIDC Core and Financial-grade API (FAPI) signing requirements."
    },
    {
      "lang": "es",
      "value": "Se encontr\u00f3 un fallo en Keycloak. Cuando se env\u00eda un objeto de solicitud cifrado con JSON Web Encryption (JWE), Keycloak puede procesar incorrectamente las reclamaciones sin firmar si el contenido descifrado es JSON en bruto, eludiendo la pol\u00edtica de firma configurada. Esto permite a un atacante remoto enviar reclamaciones no autorizadas, lo que lleva a un compromiso de la integridad de los datos dentro del flujo de autorizaci\u00f3n de OpenID Connect (OIDC). Si bien una lista de permitidos de URI de redirecci\u00f3n act\u00faa como un control compensatorio, esta vulnerabilidad viola los requisitos de firma de OIDC Core y Financial-grade API (FAPI)."
    }
  ],
  "id": "CVE-2026-9793",
  "lastModified": "2026-10-26T12:10:00.130",
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          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.9,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "version": "3.1"
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          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
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          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
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            {
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          "role": "CISA Coordinator",
          "timestamp": "2026-05-30T01:52:59.517905Z",
          "version": "2.0.3"
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  "published": "2026-05-28T05:16:40.697",
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      "url": "https://access.redhat.com/errata/RHSA-2026:50846"
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  "vulnStatus": "Modified",
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          "value": "CWE-347"
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      "source": "secalert@redhat.com",
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    }
  ]
}



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