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CVE-2026-88017

Estado: AnalizadaAlta (7.3)—

rclone is a command-line program to sync files and directories to and from different cloud storage providers. From 1.64.0 until 1.75.1, the FTP auth-proxy driver in cmd/serve/ftp/ftp.go stores one obscured password per username in the server-wide userPass map[string]string instead of binding the credential or VFS to the authenticated session. If two accepted credentials use the same username but resolve to different proxy backends, a later CheckPasswd login overwrites userPass[user], and subsequent getVFS operations on the first session are reauthorized with the later password.

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The first session can then read, create, overwrite, rename, or delete objects using the second credential’s backend authority. Exploitation requires the later same-username login to occur while the first session remains open. This issue is fixed in version 1.75.1.

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.

Explotación T1203: requiere UI:R (interacción del usuario abriendo sesión FTP concurrente). Impactos: lectura de datos de segundo usuario (T1005), sobrescritura/eliminación de archivos (T1565.001), eliminación de evidencias (T1070.004) mediante acceso a backend ajeno.

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

Restrict File and Directory PermissionsRemote Data StorageEncrypt Sensitive InformationApplication Isolation and SandboxingExploit ProtectionUpdate Software

Tecnologías afectadas (1)

Rclone — Rclone

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-88017",
  "cveTags": [],
  "metrics": {
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          "options": [
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  "lastModified": "2026-09-14T20:00:53.363",
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