Description
Rclone from v1.68.0 before v1.75.2 contains an authorization bypass vulnerability in serve s3 --auth-proxy that allows authenticated tenants to manipulate other tenants' multipart uploads by referencing their upload IDs. Attackers who learn a victim's bucket, object, and upload ID can inject parts, complete, or abort in-flight uploads and view upload and object metadata across tenants.
Published: 2026-10-25
Score: 6.1 Medium
EPSS: < 1% Very Low
KEV: No
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Mon, 26 Oct 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 26 Oct 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Sun, 25 Oct 2026 13:45:00 +0000

Type Values Removed Values Added
Description Rclone from v1.68.0 before v1.75.2 contains an authorization bypass vulnerability in serve s3 --auth-proxy that allows authenticated tenants to manipulate other tenants' multipart uploads by referencing their upload IDs. Attackers who learn a victim's bucket, object, and upload ID can inject parts, complete, or abort in-flight uploads and view upload and object metadata across tenants.
Title Rclone v1.68.0 before v1.75.2 Authorization Bypass in serve s3 Multipart Uploads
First Time appeared Rclone
Rclone rclone
Weaknesses CWE-639
CPEs cpe:2.3:a:rclone:rclone:*:*:*:*:*:*:*:*
Vendors & Products Rclone
Rclone rclone
References
Metrics cvssV3_1

{'score': 5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L'}

cvssV4_0

{'score': 6.1, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-26T16:42:27.522Z

Reserved: 2026-10-25T12:26:13.488Z

Link: CVE-2026-116187

cve-icon Vulnrichment

Updated: 2026-10-26T15:38:36.825Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-25T14:16:58.817

Modified: 2026-10-26T17:17:23.330

Link: CVE-2026-116187

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-25T13:20:23Z

Links: CVE-2026-116187 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-25T18:00:10Z

Weaknesses
  • CWE-639

    Authorization Bypass Through User-Controlled Key