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CVSS 9.8 · CRITICAL

CVE-2026-41176

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.

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Analysis

Rclone versions 1.45.0 to 1.73.4 contain a critical vulnerability where an unauthenticated attacker can disable security requirements on the Remote Control (RC) interface. This allows unauthorized access to administrative functions, potentially exposing cloud storage configurations and sensitive data. If you run rclone with the RC server enabled for automation or management, upgrade to version 1.73.5 immediately.

Severity

Score: 9.8(CRITICAL)
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AV: NETWORK
AC: LOW
PR: NONE
UI: NONE
S: UNCHANGED
C: HIGH
I: HIGH
A: HIGH
Weakness (CWE): CWE-306

EPSS

Probability of exploitation (next 30 days): 0.0630 (6.3%)
Percentile: 91.0%
EPSS: 2026-05-06

Affects

rclone:rclone

Technical 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.

Published: 4/23/2026, 12:16:45 AM
Last modified: 4/27/2026, 6:19:45 PM

References

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