CVE-2026-55183: RClone Manager: Unauthenticated RClone Daemon Enables Remote Attack via Malicious Web Page
RClone Manager is a cross-platform GUI application designed to help users manage Rclone remotes efficiently. Prior to 0.2.7, RClone Manager starts the local rclone rcd service on 127.0.0.1:51900 with --rc-no-auth, --rc-allow-origin , and --rc-serve. A malicious web page opened by a user while the daemon is running can therefore send cross-origin requests to the unauthenticated local API with the user's operating-system privileges. The requests can disclose configured storage credentials and potentially access, upload, modify, or exfiltrate locally stored files accessible to the user and files available through configured remotes; the advisory's possible command-execution impact remains unconfirmed. This issue is fixed in version 0.2.7.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
RClone Managerto a version that resolves this vulnerability.Fixed in 0.2.7
Event History
Frequently Asked Questions
Which installations are exposed?
RClone Manager versions before 0.2.7 are affected when the application starts its local rclone rcd service. The service listens on 127.0.0.1:51900 with no authentication and permits requests from any web origin.
What must an attacker do to exploit this issue?
The attacker needs a user to open a malicious web page while the local daemon is running. That page can then issue cross-origin requests to the local API without needing credentials for the API.
What could an attacker access through the exposed API?
Requests may disclose configured storage credentials and may access, upload, modify, or exfiltrate files available to the user's operating-system account, including files accessible through configured remotes. Possible command execution is described as unconfirmed.
How can I determine whether a system is affected?
Check whether RClone Manager is older than version 0.2.7 and whether it has started rclone rcd on 127.0.0.1:51900. An affected daemon uses --rc-no-auth, --rc-allow-origin *, and --rc-serve.
What is the available remediation?
Upgrade RClone Manager to version 0.2.7, which fixes the issue.