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CVE-2026-34457

Estado: AnalizadaCrítica (9.1)—

OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers. Versions prior to 7.15.2 contain a configuration-dependent authentication bypass in deployments where OAuth2 Proxy is used with an auth_request-style integration (such as nginx auth_request) and either --ping-user-agent is set or --gcp-healthchecks is enabled.

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In affected configurations, OAuth2 Proxy treats any request with the configured health check User-Agent value as a successful health check regardless of the requested path, allowing an unauthenticated remote attacker to bypass authentication and access protected upstream resources. Deployments that do not use auth_request-style subrequests or that do not enable --ping-user-agent/--gcp-healthchecks are not affected. This issue is fixed in 7.15.2.

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad remota sin autenticación ni interacción (AV:N, PR:N, UI:N) que permite bypass de autenticación OAuth2 mediante manipulación de User-Agent, otorgando acceso no autorizado a recursos protegidos.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Privileged Account ManagementApplication Developer GuidanceActive Directory ConfigurationVulnerability ScanningUser TrainingUser Account Management

Tecnologías afectadas (1)

Oauth2 Proxy Project — Oauth2 Proxy

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-34457",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-34457",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-04-15T17:43:23.417901Z"
        }
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        "cvssData": {
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          "version": "3.1",
          "baseScore": 9.1,
          "attackVector": "NETWORK",
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
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        "impactScore": 5.2,
        "exploitabilityScore": 3.9
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      "affectedData": [
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  "published": "2026-04-14T23:16:28.330",
  "references": [
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      "lang": "en",
      "value": "OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers. Versions prior to 7.15.2 contain a configuration-dependent authentication bypass in deployments where OAuth2 Proxy is used with an auth_request-style integration (such as nginx auth_request) and either --ping-user-agent is set or --gcp-healthchecks is enabled. In affected configurations, OAuth2 Proxy treats any request with the configured health check User-Agent value as a successful health check regardless of the requested path, allowing an unauthenticated remote attacker to bypass authentication and access protected upstream resources. Deployments that do not use auth_request-style subrequests or that do not enable --ping-user-agent/--gcp-healthchecks are not affected. This issue is fixed in 7.15.2."
    },
    {
      "lang": "es",
      "value": "OAuth2 Proxy es un proxy inverso que proporciona autenticación utilizando proveedores OAuth2. Las versiones anteriores a la 7.15.2 contienen una omisión de autenticación dependiente de la configuración en implementaciones donde OAuth2 Proxy se utiliza con una integración de estilo auth_request (como nginx auth_request) y se establece --ping-user-agent o se habilita --gcp-healthchecks. En las configuraciones afectadas, OAuth2 Proxy trata cualquier solicitud con el valor configurado de User-Agent de verificación de estado como una verificación de estado exitosa, independientemente de la ruta solicitada, permitiendo a un atacante remoto no autenticado omitir la autenticación y acceder a recursos ascendentes protegidos. Las implementaciones que no utilizan subsolicitudes de estilo auth_request o que no habilitan --ping-user-agent/--gcp-healthchecks no se ven afectadas. Este problema se soluciona en la 7.15.2."
    }
  ],
  "lastModified": "2026-07-24T22:10:00.140",
  "configurations": [
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