CVE-2026-49473

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{"affected": [{"affectedData": [{"product": "authorization-for-expressjs", "vendor": "cedar-policy", "versions": [{"status": "affected", "version": "< 0.3.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "@cedar-policy/authorization-for-expressjs is an open-source Express.js middleware that integrates Cedar authorization into Express applications by mapping HTTP requests to Cedar actions and evaluating authorization policies before allowing requests to proceed. Versions prior to 0.3.0 have an issue where, under certain circumstances, the middleware matches incoming requests against Cedar action mappings using req.originalUrl, which includes the query string, while Express routes requests using only the path component. The middleware uses req.originalUrl to match incoming requests against Cedar action mappings. In Express, req.originalUrl includes the query string, while route matching uses only the path. This creates a divergence between what Cedar authorizes and what Express executes. When an application defines separate actions for overlapping path prefixes with different authorization requirements (for example, GET /users for listing all users with admin-only access, and GET /users/{id} for retrieving a single user with any authenticated user access), an actor can append a query string to bypass the more restrictive policy. Sending GET /users/?x=1 causes the middleware to match against /users/{id} (with id parameter set to ?x=1) and evaluate the less restrictive action, while Express routes the request to the /users list handler. This allows inappropriate access to the more restrictive endpoint. This issue has been addressed in version 0.30. Some workarounds are available. Validate and sanitize incoming request paths before they reach the authorization middleware. Ensure that applications do not rely solely on the middleware for authorization when defining multiple actions on overlapping path prefixes with different permission levels."}, {"lang": "es", "value": "@cedar-policy/authorization-for-expressjs es un middleware de Express.js de c\u00f3digo abierto que integra la autorizaci\u00f3n de Cedar en aplicaciones Express mapeando solicitudes HTTP a acciones de Cedar y evaluando pol\u00edticas de autorizaci\u00f3n antes de permitir que las solicitudes contin\u00faen. Las versiones anteriores a la 0.3.0 tienen un problema donde, bajo ciertas circunstancias, el middleware compara las solicitudes entrantes con las asignaciones de acciones de Cedar usando req.originalUrl, que incluye la cadena de consulta, mientras que Express enruta las solicitudes usando solo el componente de ruta. El middleware usa req.originalUrl para comparar las solicitudes entrantes con las asignaciones de acciones de Cedar. En Express, req.originalUrl incluye la cadena de consulta, mientras que la coincidencia de rutas usa solo la ruta. Esto crea una divergencia entre lo que Cedar autoriza y lo que Express ejecuta. Cuando una aplicaci\u00f3n define acciones separadas para prefijos de ruta superpuestos con diferentes requisitos de autorizaci\u00f3n (por ejemplo, GET /users para listar todos los usuarios con acceso solo para administradores, y GET /users/{id} para recuperar un solo usuario con acceso para cualquier usuario autenticado), un actor puede a\u00f1adir una cadena de consulta para eludir la pol\u00edtica m\u00e1s restrictiva. Enviar GET /users/?x=1 hace que el middleware coincida con /users/{id} (con el par\u00e1metro id establecido en ?x=1) y eval\u00fae la acci\u00f3n menos restrictiva, mientras que Express enruta la solicitud al gestor de la lista /users. Esto permite un acceso inapropiado al endpoint m\u00e1s restrictivo. Este problema ha sido abordado en la versi\u00f3n 0.30. Algunas soluciones provisionales est\u00e1n disponibles. Valide y sanee las rutas de solicitud entrantes antes de que lleguen al middleware de autorizaci\u00f3n. Aseg\u00farese de que las aplicaciones no dependan \u00fanicamente del middleware para la autorizaci\u00f3n al definir m\u00faltiples acciones en prefijos de ruta superpuestos con diferentes niveles de permiso."}], "id": "CVE-2026-49473", "lastModified": "2026-10-24T16:10:00.153", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-49473", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-08-13T13:10:02.673287Z", "version": "2.0.3"}}]}, "published": "2026-08-13T00:17:32.587", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/cedar-policy/authorization-for-expressjs/releases/tag/v0.3.0"}, {"source": "security-advisories@github.com", "url": "https://github.com/cedar-policy/authorization-for-expressjs/security/advisories/GHSA-g4w6-vmgf-xqvx"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-436"}, {"lang": "en", "value": "CWE-863"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

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