SB2026060816 - Missing Authentication for Critical Function in rclone

Description

This security bulletin contains information about 1 vulnerability.

1) Missing Authentication for Critical Function (CVE-ID: CVE-2026-49980)

CWE-ID: CWE-306 - Missing Authentication for Critical Function

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber

The vulnerability allows a remote attacker to execute arbitrary commands.

The vulnerability exists due to missing authentication for a critical function in the rclone remote control file-serving handler when handling unauthenticated GET or HEAD requests to /[remote:path]/object paths with inline remote instantiation. A remote attacker can send a specially crafted request to execute arbitrary commands.

Exploitation requires the remote control API to be enabled and reachable, the --rc-serve flag to be in use, and global RC HTTP authentication to be absent.

Remediation

Install update from vendor's website.

References

• https://github.com/rclone/rclone/security/advisories/GHSA-qw24-gh76-8rvv
• https://github.com/rclone/rclone/commit/rc-fix-unauthenticated-command-execution-via-rc-serve-inline-remotes