FKIE_CVE-2026-1486

Vulnerability from fkie_nvd - Published: 2026-02-09 20:15 - Updated: 2026-02-10 02:15
Severity ?
8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
A flaw was found in Keycloak. A vulnerability exists in the jwt-authorization-grant flow where the server fails to verify if an Identity Provider (IdP) is enabled before issuing tokens. The issuer lookup mechanism (lookupIdentityProviderFromIssuer) retrieves the IdP configuration but does not filter for isEnabled=false. If an administrator disables an IdP (e.g., due to a compromise or offboarding), an entity possessing that IdP's signing key can still generate valid JWT assertions that Keycloak accepts, resulting in the issuance of valid access tokens.
References
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:2365
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:2366
secalert@redhat.comhttps://access.redhat.com/security/cve/CVE-2026-1486
secalert@redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=2433347
Impacted products
Vendor Product Version
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A flaw was found in Keycloak. A vulnerability exists in the jwt-authorization-grant flow where the server fails to verify if an Identity Provider (IdP) is enabled before issuing tokens. The issuer lookup mechanism (lookupIdentityProviderFromIssuer) retrieves the IdP configuration but does not filter for isEnabled=false. If an administrator disables an IdP (e.g., due to a compromise or offboarding), an entity possessing that IdP\u0027s signing key can still generate valid JWT assertions that Keycloak accepts, resulting in the issuance of valid access tokens."
    },
    {
      "lang": "es",
      "value": "Se encontr\u00f3 un fallo en Keycloak. Existe una vulnerabilidad en el flujo jwt-authorization-grant donde el servidor no verifica si un Proveedor de Identidad (IdP) est\u00e1 habilitado antes de emitir tokens. El mecanismo de b\u00fasqueda del emisor (lookupIdentityProviderFromIssuer) recupera la configuraci\u00f3n del IdP pero no filtra por isEnabled=false. Si un administrador deshabilita un IdP (por ejemplo, debido a un compromiso o una baja), una entidad que posea la clave de firma de ese IdP a\u00fan puede generar aserciones JWT v\u00e1lidas que Keycloak acepta, lo que resulta en la emisi\u00f3n de tokens de acceso v\u00e1lidos."
    }
  ],
  "id": "CVE-2026-1486",
  "lastModified": "2026-02-10T02:15:52.143",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9,
        "source": "secalert@redhat.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-02-09T20:15:55.717",
  "references": [
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:2365"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:2366"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/security/cve/CVE-2026-1486"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2433347"
    }
  ],
  "sourceIdentifier": "secalert@redhat.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-358"
        }
      ],
      "source": "secalert@redhat.com",
      "type": "Secondary"
    }
  ]
}


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