CVE-2026-88044

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    CVE-2026-88044

    Published: 10 Sept 2026Last Modified: 11 Sept 2026

    Summary: rclone: RC per-server auth-proxy bypass

    Details: rclone is a command-line program to sync files and directories to and from different cloud storage providers. From 1.70.0 until 1.75.1, the serve/start RC interface accepts per-server proxyOpt.AuthProxy settings, and the FTP and S3 constructors in cmd/serve/ftp/ftp.go and cmd/serve/s3/server.go incorrectly check the process-global proxy.Opt.AuthProxy value instead. When the global value is empty, the request-local authentication proxy is ignored: FTP falls back to the fixed filesystem with username anonymous and any password, while S3 with AuthKey serves the fixed RC fs rather than the backend selected by the proxy. The dedicated command-line servers that configure the global option are not affected. This issue is fixed in version 1.75.1.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/88xxx/CVE-2026-88044.json, https://github.com/rclone/rclone/commit/739403963abf6f58003c2becd5f7c4ad0d644153, https://github.com/rclone/rclone/releases/tag/v1.75.1, https://github.com/rclone/rclone/security/advisories/GHSA-p569-5gjg-9cmj, https://nvd.nist.gov/vuln/detail/CVE-2026-88044

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 9d464e8e9a56a988bbb5f701006173c9bbefeb6a
    Fixed -687d264b689b8c49a67e2e52a8a5e0caa01c04ce

    Affected versions

    v1.75.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-88044 | CVE-DB