CVE-2025-62379

{
  "id": "CVE-2025-62379",
  "sourceIdentifier": "[email protected]",
  "published": "2025-10-15T16:15:36.357",
  "lastModified": "2026-10-19T16:10:00.260",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Reflex is a library to build full-stack web apps in pure Python. In versions 0.5.4 through 0.8.14, the /auth-codespace endpoint automatically assigns the redirect_to query parameter value directly to client-side links without any validation and triggers automatic clicks when the page loads in a GitHub Codespaces environment. This allows attackers to redirect users to arbitrary external URLs. The vulnerable route is only registered when a Codespaces environment is detected, and the detection is controlled by environment variables. The same behavior can be activated in production if the GITHUB_CODESPACES_PORT_FORWARDING_DOMAIN environment variable is set. The vulnerability occurs because the code assigns the redirect_to query parameter directly to a.href without any validation and immediately triggers a click (automatic navigation), allowing users to be sent to arbitrary external domains. The execution condition is based on the presence of a sessionStorage flag, meaning it triggers immediately on first visits or in incognito/private browsing windows, with no server-side origin/scheme whitelist or internal path enforcement defenses in place. This issue has been patched in version 0.8.15. As a workaround, users can ensure that GITHUB_CODESPACES_PORT_FORWARDING_DOMAIN is not set in a production environment."
    },
    {
      "lang": "es",
      "value": "Reflex es una biblioteca para construir aplicaciones web full-stack en Python puro. En las versiones 0.5.4 a 0.8.14, el endpoint /auth-codespace asigna automáticamente el valor del parámetro de consulta redirect_to directamente a los enlaces del lado del cliente sin ninguna validación y activa clics automáticos cuando la página se carga en un entorno de GitHub Codespaces. Esto permite a los atacantes redirigir a los usuarios a URL externas arbitrarias. La ruta vulnerable solo se registra cuando se detecta un entorno de Codespaces, y la detección está controlada por variables de entorno. El mismo comportamiento puede activarse en producción si la variable de entorno GITHUB_CODESPACES_PORT_FORWARDING_DOMAIN está configurada. La vulnerabilidad ocurre porque el código asigna el parámetro de consulta redirect_to directamente a a.href sin ninguna validación e inmediatamente activa un clic (navegación automática), permitiendo que los usuarios sean enviados a dominios externos arbitrarios. La condición de ejecución se basa en la presencia de una bandera de sessionStorage, lo que significa que se activa inmediatamente en las primeras visitas o en ventanas de navegación de incógnito/privada, sin defensas de lista blanca de origen/esquema del lado del servidor o de aplicación de rutas internas implementadas. Este problema ha sido parcheado en la versión 0.8.15. Como solución alternativa, los usuarios pueden asegurarse de que GITHUB_CODESPACES_PORT_FORWARDING_DOMAIN no esté configurado en un entorno de producción."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "reflex-dev",
          "product": "reflex",
          "versions": [
            {
              "version": ">= 0.5.4, < 0.8.15",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N",
          "baseScore": 3.1,
          "baseSeverity": "LOW",
          "attackVector": "NETWORK",
          "attackComplexity": "HIGH",
          "privilegesRequired": "NONE",
          "userInteraction": "REQUIRED",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 1.6,
        "impactScore": 1.4
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2025-10-15T17:17:48.463909Z",
          "id": "CVE-2025-62379",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-601"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/reflex-dev/reflex/commit/ade12549f3c0ddab3d7382c581bc04a3c1f989ec",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/reflex-dev/reflex/security/advisories/GHSA-rfh5-c9h5-q8jm",
      "source": "[email protected]"
    }
  ]
}