CVE-2026-29792

Estado: AnalizadaCrítica (9.3)—

Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. From 5.0.0 to before 5.0.42, an unauthenticated attacker can send a crafted GET request directly to /oauth/:provider/callback with a forged profile in the query string. The OAuth service's authentication payload has a fallback chain that reaches params.query (the raw request query) when Grant's session/state responses are empty. Since the attacker never initiated an OAuth authorize flow, Grant has no session to work with and produces no response, so the fallback fires.

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The forged profile then drives entity lookup and JWT minting. The attacker gets a valid access token for an existing user without ever contacting the OAuth provider. This vulnerability is fixed in 5.0.42.

CVSS

Versión: 4.0
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Puntuación base: 9.3

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.63%
Percentil entre todas las CVEs puntuadas: 48
Fecha de la puntuación: 6/10/2026

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.

ExplotaciónT1190 Exploit Public-Facing Applicationinitial access95 %
Impacto principalT1078 Valid Accountsstealth · persistence · privilege escalation · initial access95 %
Impacto secundarioT1556 Modify Authentication Processdefense impairment · persistence · credential access80 %

Explotación remota sin autenticación (AV:N, PR:N, UI:N) contra aplicación expuesta. Impacto: obtención de token JWT válido y acceso como usuario existente sin credenciales legítimas.

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 Management User Account Management Password Policies Multi-factor Authentication Application Developer Guidance Active Directory Configuration

Tecnologías afectadas (1)

Feathersjs — Feathers

CWE

CWE-287

Referencias

https://github.com/feathersjs/feathers/security/advisories/GHSA-wg9x-qfgw-pxhj

JSON original (NVD)

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      "value": "Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. From 5.0.0 to before 5.0.42, an unauthenticated attacker can send a crafted GET request directly to /oauth/:provider/callback with a forged profile in the query string. The OAuth service's authentication payload has a fallback chain that reaches params.query (the raw request query) when Grant's session/state responses are empty. Since the attacker never initiated an OAuth authorize flow, Grant has no session to work with and produces no response, so the fallback fires. The forged profile then drives entity lookup and JWT minting. The attacker gets a valid access token for an existing user without ever contacting the OAuth provider. This vulnerability is fixed in 5.0.42."
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      "lang": "es",
      "value": "Feathersjs es un framework para crear APIs web y aplicaciones en tiempo real con TypeScript o JavaScript. Desde la 5.0.0 hasta antes de la 5.0.42, un atacante no autenticado puede enviar una solicitud GET manipulada directamente a /oauth/:provider/callback con un perfil falsificado en la cadena de consulta. La carga útil de autenticación del servicio OAuth tiene una cadena de reserva que alcanza params.query (la consulta de solicitud sin procesar) cuando las respuestas de sesión/estado de Grant están vacías. Dado que el atacante nunca inició un flujo de autorización OAuth, Grant no tiene sesión con la que trabajar y no produce ninguna respuesta, por lo que la reserva se activa. El perfil falsificado luego impulsa la búsqueda de entidades y la acuñación de JWT. El atacante obtiene un token de acceso válido para un usuario existente sin contactar nunca al proveedor OAuth. Esta vulnerabilidad se corrige en la 5.0.42."
    }
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