CVE-2026-41179 PoC — RClone: Unauthenticated operations/fsinfo allows attacker-controlled backend instantiation and local command execution

Title:RClone: Unauthenticated operations/fsinfo allows attacker-controlled backend instantiation and local command execution (CVE-2026-41179)
Description:Rclone is a command-line program to sync files and directories to and from different cloud storage providers. Starting in version 1.48.0 and prior to version 1.73.5, the RC endpoint `operations/fsinfo` is exposed without `AuthRequired: true` and accepts attacker-controlled `fs` input. Because `rc.GetFs(...)` supports inline backend definitions, an unauthenticated attacker can instantiate an attacker-controlled backend on demand. For the WebDAV backend, `bearer_token_command` is executed during backend initialization, making single-request unauthenticated local command execution possible on reachable RC deployments without global HTTP authentication. Version 1.73.5 patches the issue.

Rclone >= 1.48.0 and < 1.73.5 contains an unauthenticated local command execution caused by unauthenticated access to the RC endpoint operations/fsinfo with attacker-controlled fs input, letting unauthenticated attackers execute local commands, exploit requires reachable RC deployment without global HTTP authentication.

 id: CVE-2026-41179

info:
  name: RClone RC - Command Injection
  author: theamanrawat
  severity: c

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