CVE-2026-41176 PoC — Rclone: Unauthenticated options/set allows runtime auth bypass, leading to sensitive operations and command execution

Title:Rclone: Unauthenticated options/set allows runtime auth bypass, leading to sensitive operations and command execution (CVE-2026-41176)
Description:Rclone is a command-line program to sync files and directories to and from different cloud storage providers. The RC endpoint `options/set` is exposed without `AuthRequired: true`, but it can mutate global runtime configuration, including the RC option block itself. Starting in version 1.45.0 and prior to version 1.73.5, an unauthenticated attacker can set `rc.NoAuth=true`, which disables the authorization gate for many RC methods registered with `AuthRequired: true` on reachable RC servers that are started without global HTTP authentication. This can lead to unauthorized access to sensitive administrative functionality, including configuration and operational RC methods. Version 1.73.5 patches the issue.

Rclone >= 1.45.0 and < 1.73.5 contains a broken access control vulnerability caused by unauthenticated access to the RC endpoint `options/set` allowing mutation of global runtime configuration, letting unauthenticated attackers access sensitive administrative functions, exploit requires RC server started without global HTTP authentication.

 id: CVE-2026-41176

info:
  name: Rclone RC - Broken Access Control
  author: theamanrawat
  severit

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