Missing Authentication for Critical Function Affecting github.com/rclone/rclone/fs/rc/rcserver package, versions >=1.46.0 <1.74.3
Threat Intelligence
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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- published1 Jul 2026
- disclosed16 Jun 2026
- creditUnknown
Introduced: 16 Jun 2026
CVE-2026-49980 Â (opens in a new tab)How to fix?
Upgrade github.com/rclone/rclone/fs/rc/rcserver to version 1.74.3 or higher.
Overview
Affected versions of this package are vulnerable to Missing Authentication for Critical Function via the rclone rcd --rc-serve process. An attacker can execute arbitrary commands as the process user by sending unauthenticated GET or HEAD requests to specific paths, which trigger backend initialization with attacker-controlled inline remote configuration. This is only exploitable if the remote control API is enabled, reachable by the attacker, deployed without global RC HTTP authentication, and the --rc-serve flag is in use.
Workaround
This vulnerability can be mitigated by configuring HTTP authentication on the remote control API using --rc-user, --rc-pass, or --rc-htpasswd, or by not using the --rc-serve flag if file serving is not required.