Missing Authentication for Critical Function Affecting github.com/rclone/rclone/fs/rc/rcserver package, versions >=1.45 <1.73.5
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-GOLANG-GITHUBCOMRCLONERCLONEFSRCRCSERVER-16191585
- published24 Apr 2026
- disclosed23 Apr 2026
- credit0wnerDied
Introduced: 23 Apr 2026
CVE-2026-41176 Â (opens in a new tab)How to fix?
Upgrade github.com/rclone/rclone/fs/rc/rcserver to version 1.73.5 or higher.
Overview
Affected versions of this package are vulnerable to Missing Authentication for Critical Function in the options/set endpoint. An attacker can set rc.NoAuth=true and override default AuthRequired: true which can lead to unauthorized access to sensitive administrative functionality, including configuration and operational RC methods.
Note:
This is only exploitable if:
remote control API is enabled, either by the
--rcflag or by running therclone rcdserver;remote control API must be reachable by the attacker - by default rclone only serves the rc to localhost unless the
--rc-addrflag is in use;rc must have been deployed without global RC HTTP authentication - so not using
--rc-user/--rc-pass/--rc-htpasswdetc.