CVE-2026-1486

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.

CVSS v3 8.8 HIGH

8.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://access.redhat.com/errata/RHSA-2026:2365
https://access.redhat.com/errata/RHSA-2026:2366
https://access.redhat.com/security/cve/CVE-2026-1486
https://bugzilla.redhat.com/show_bug.cgi?id=2433347
https://access.redhat.com/errata/RHSA-2026:2365
https://access.redhat.com/errata/RHSA-2026:2366
https://access.redhat.com/security/cve/CVE-2026-1486
https://bugzilla.redhat.com/show_bug.cgi?id=2433347
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1486.json

Configurations

No configuration.

History

No history.

Information

Published : 2026-02-09 20:15

Updated : 2026-07-15 02:18

NVD link : CVE-2026-1486

Mitre link : CVE-2026-1486

CVE.ORG link : CVE-2026-1486

JSON object : View

Products Affected

No product.

CWE

CWE-358

Improperly Implemented Security Check for Standard

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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."}, {"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."}], "lastModified": "2026-07-15T02:18:14.947", "sourceIdentifier": "secalert@redhat.com"}