CVE-2025-62379

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{"affected": [{"affectedData": [{"product": "reflex", "vendor": "reflex-dev", "versions": [{"status": "affected", "version": ">= 0.5.4, < 0.8.15"}]}], "source": "security-advisories@github.com"}], "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 autom\u00e1ticamente el valor del par\u00e1metro de consulta redirect_to directamente a los enlaces del lado del cliente sin ninguna validaci\u00f3n y activa clics autom\u00e1ticos cuando la p\u00e1gina 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 detecci\u00f3n est\u00e1 controlada por variables de entorno. El mismo comportamiento puede activarse en producci\u00f3n si la variable de entorno GITHUB_CODESPACES_PORT_FORWARDING_DOMAIN est\u00e1 configurada. La vulnerabilidad ocurre porque el c\u00f3digo asigna el par\u00e1metro de consulta redirect_to directamente a a.href sin ninguna validaci\u00f3n e inmediatamente activa un clic (navegaci\u00f3n autom\u00e1tica), permitiendo que los usuarios sean enviados a dominios externos arbitrarios. La condici\u00f3n de ejecuci\u00f3n 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 navegaci\u00f3n de inc\u00f3gnito/privada, sin defensas de lista blanca de origen/esquema del lado del servidor o de aplicaci\u00f3n de rutas internas implementadas. Este problema ha sido parcheado en la versi\u00f3n 0.8.15. Como soluci\u00f3n alternativa, los usuarios pueden asegurarse de que GITHUB_CODESPACES_PORT_FORWARDING_DOMAIN no est\u00e9 configurado en un entorno de producci\u00f3n."}], "id": "CVE-2025-62379", "lastModified": "2026-10-19T16:10:00.260", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.1, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 1.4, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-62379", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-10-15T17:17:48.463909Z", "version": "2.0.3"}}]}, "published": "2025-10-15T16:15:36.357", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/reflex-dev/reflex/commit/ade12549f3c0ddab3d7382c581bc04a3c1f989ec"}, {"source": "security-advisories@github.com", "url": "https://github.com/reflex-dev/reflex/security/advisories/GHSA-rfh5-c9h5-q8jm"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-601"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

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