CVE-2026-27192

Estado: AnalizadaAlta (7.6)—

Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. In versions 5.0.39 and below, origin validation uses startsWith() for comparison, allowing attackers to bypass the check by registering a domain that shares a common prefix with an allowed origin.The getAllowedOrigin() function checks if the Referer header starts with any allowed origin, and this comparison is insufficient as it only validates the prefix.

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This is exploitable when the origins array is configured and an attacker registers a domain starting with an allowed origin string (e.g., https://target.com.attacker.com bypasses https://target.com). On its own, tokens are still redirected to a configured origin. However, in specific scenarios an attacker can initiate the OAuth flow from an unauthorized origin and exfiltrate tokens, achieving full account takeover. This issue has bee fixed in version 5.0.40.

CVSS

Versión: 4.0
Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/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: 7.6

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.30%
Percentil entre todas las CVEs puntuadas: 21
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.

ExplotaciónT1203 Exploitation for Client Executionexecution85 %
Impacto principalT1556 Modify Authentication Processdefense impairment · persistence · credential access80 %
Impacto secundarioT1078 Valid Accountsstealth · persistence · privilege escalation · initial access75 %

Requiere interacción del usuario (UI:P) para ejecutar el ataque OAuth. Los impactos son modificación de configuración autenticación (T1556) y acceso a cuentas comprometidas mediante tokens OAuth (T1078).

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

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

Tecnologías afectadas (1)

Feathersjs — Feathers

CWE

CWE-346

Referencias

JSON original (NVD)

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      "value": "Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. In versions 5.0.39 and below, origin validation uses startsWith() for comparison, allowing attackers to bypass the check by registering a domain that shares a common prefix with an allowed origin.The getAllowedOrigin() function checks if the Referer header starts with any allowed origin, and this comparison is insufficient as it only validates the prefix. This is exploitable when the origins array is configured and an attacker registers a domain starting with an allowed origin string (e.g., https://target.com.attacker.com bypasses https://target.com). On its own, tokens are still redirected to a configured origin. However, in specific scenarios an attacker can initiate the OAuth flow from an unauthorized origin and exfiltrate tokens, achieving full account takeover. This issue has bee fixed in version 5.0.40."
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      "value": "Feathersjs es un framework para crear APIs web y aplicaciones en tiempo real con TypeScript o JavaScript. En las versiones 5.0.39 e inferiores, la validación de origen utiliza startsWith() para la comparación, lo que permite a los atacantes eludir la verificación al registrar un dominio que comparte un prefijo común con un origen permitido. La función getAllowedOrigin() comprueba si el encabezado Referer comienza con cualquier origen permitido, y esta comparación es insuficiente ya que solo valida el prefijo. Esto es explotable cuando el array de orígenes está configurado y un atacante registra un dominio que comienza con una cadena de origen permitida (p. ej., https://target.com.attacker.com elude https://target.com). Por sí solos, los tokens siguen siendo redirigidos a un origen configurado. Sin embargo, en escenarios específicos un atacante puede iniciar el flujo de OAuth desde un origen no autorizado y exfiltrar tokens, logrando una toma de control total de la cuenta. Este problema ha sido solucionado en la versión 5.0.40."
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