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CVE-2021-32786

Estado: ModificadaMedia (6.1)—

mod_auth_openidc is an authentication/authorization module for the Apache 2.x HTTP server that functions as an OpenID Connect Relying Party, authenticating users against an OpenID Connect Provider. In versions prior to 2.4.9, `oidc_validate_redirect_url()` does not parse URLs the same way as most browsers do. As a result, this function can be bypassed and leads to an Open Redirect vulnerability in the logout functionality.

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This bug has been fixed in version 2.4.9 by replacing any backslash of the URL to redirect with slashes to address a particular breaking change between the different specifications (RFC2396 / RFC3986 and WHATWG). As a workaround, this vulnerability can be mitigated by configuring `mod_auth_openidc` to only allow redirection whose destination matches a given regular expression.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (2)

Fedoraproject — FedoraOpenidc — MOD Auth Openidc

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2021-32786",
  "cveTags": [],
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    "cvssMetricV2": [
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        "type": "Primary",
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          "baseScore": 5.8,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
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        "acInsufInfo": false,
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      "lang": "en",
      "value": "mod_auth_openidc is an authentication/authorization module for the Apache 2.x HTTP server that functions as an OpenID Connect Relying Party, authenticating users against an OpenID Connect Provider. In versions prior to 2.4.9, `oidc_validate_redirect_url()` does not parse URLs the same way as most browsers do. As a result, this function can be bypassed and leads to an Open Redirect vulnerability in the logout functionality. This bug has been fixed in version 2.4.9 by replacing any backslash of the URL to redirect with slashes to address a particular breaking change between the different specifications (RFC2396 / RFC3986 and WHATWG). As a workaround, this vulnerability can be mitigated by configuring `mod_auth_openidc` to only allow redirection whose destination matches a given regular expression."
    },
    {
      "lang": "es",
      "value": "mod_auth_openidc es un módulo de autenticación/autorización para el servidor HTTP Apache versión 2.x que funciona como un OpenID Connect Relying Party, autenticando a usuarios contra un OpenID Connect Provider. En versiones anteriores a 2.4.9, \"oidc_validate_redirect_url()\" no analiza las URLs de la misma manera que la mayoría de los navegadores. Como resultado, esta función puede ser omitida y conlleva a una vulnerabilidad de Redirección Abierta en la funcionalidad logout. Este bug ha sido corregido en versión 2.4.9 al reemplazar cualquier barra invertida de la URL a redirigir por barras inclinadas para solucionar un cambio particular de ruptura entre las diferentes especificaciones (RFC2396 / RFC3986 y WHATWG). Como solución, esta vulnerabilidad puede ser mitigada configurando \"mod_auth_openidc\" para que sólo permita la redirección cuyo destino coincida con una expresión regular determinada"
    }
  ],
  "lastModified": "2026-06-17T03:53:37.627",
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