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CVE-2026-30942

Estado: AnalizadaAlta (8.3)—

Flare is a Next.js-based, self-hostable file sharing platform that integrates with screenshot tools. Prior to 1.7.3, an authenticated path traversal vulnerability in /api/avatars/[filename] allows any logged-in user to read arbitrary files from within the application container. The filename URL parameter is passed to path.join() without sanitization, and getFileStream() performs no path validation, enabling %2F-encoded ../ sequences to escape the uploads/avatars/ directory and read any file accessible to the nextjs process under /app/. Authentication is enforced by Next.js middleware. However, on instances with open registration enabled (the default), any attacker can self-register and immediately exploit this. This vulnerability is fixed in 1.7.3.

CVSS

Probabilidad de explotación (EPSS)

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.

Acceso autenticado a servicio remoto (PR:L) con path traversal (CWE-22) para lectura de archivos arbitrarios en el contenedor; registro abierto permite explotación inmediata.

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

Vulnerability ScanningThreat Intelligence ProgramPrivileged Account ManagementNetwork SegmentationDisable or Remove Feature or ProgramApplication Isolation and Sandboxing

Tecnologías afectadas (1)

Flintsh — Flare

CWE

Referencias

JSON original (NVD)

Mostrar
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      "tags": [
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      "lang": "en",
      "value": "Flare is a Next.js-based, self-hostable file sharing platform that integrates with screenshot tools. Prior to 1.7.3, an authenticated path traversal vulnerability in /api/avatars/[filename] allows any logged-in user to read arbitrary files from within the application container. The filename URL parameter is passed to path.join() without sanitization, and getFileStream() performs no path validation, enabling %2F-encoded ../ sequences to escape the uploads/avatars/ directory and read any file accessible to the nextjs process under /app/. Authentication is enforced by Next.js middleware. However, on instances with open registration enabled (the default), any attacker can self-register and immediately exploit this. This vulnerability is fixed in 1.7.3."
    },
    {
      "lang": "es",
      "value": "Flare es una plataforma de intercambio de archivos autoalojable basada en Next.js que se integra con herramientas de captura de pantalla. Antes de la versión 1.7.3, una vulnerabilidad de salto de ruta autenticado en /api/avatars/[filename] permite a cualquier usuario con sesión iniciada leer archivos arbitrarios desde dentro del contenedor de la aplicación. El parámetro URL filename se pasa a path.join() sin sanitización, y getFileStream() no realiza validación de ruta, lo que permite que las secuencias ../ codificadas con %2F escapen del directorio uploads/avatars/ y lean cualquier archivo accesible para el proceso nextjs bajo /app/. La autenticación es aplicada por el middleware de Next.js. Sin embargo, en instancias con registro abierto habilitado (el valor predeterminado), cualquier atacante puede autorregistrarse y explotar esto inmediatamente. Esta vulnerabilidad está corregida en la versión 1.7.3."
    }
  ],
  "lastModified": "2026-06-17T10:33:11.680",
  "configurations": [
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