CVE-2026-116187

Rclone v1.68.0 before v1.75.2 Authorization Bypass in serve s3 Multipart Uploads

State: Published
Severity: 6.1 Medium
Published: Oct 25, 2026
Updated: Oct 26, 2026
Reserved: Oct 25, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	6.1 Medium	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	VulnCheck
3.1	5.0 Medium	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L	VulnCheck

Weaknesses

CWE-639 Authorization Bypass Through User-Controlled Key

Affected Products

Product	Versions
rclonerclone	1.68.0 to before 1.75.2Affected 1.75.2Not affected

References

GitHub Security Advisory (GHSA-35g6-9fjv-rmx5)vendor-advisory
VulnCheck Advisory: Rclone v1.68.0 before v1.75.2 Authorization Bypass in serve s3 Multipart Uploadsthird-party-advisory

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