CVE-2026-116187: rclone — Fix

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.

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CVSS v3.1 Score

5.0

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L

EPSS — Exploit Prediction

0.0014

Probability of exploitation

0.04%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-639 CWE-639

Affected Products

Vendor	Product	Versions
rclone	rclone	1.68.0 — 1.75.2

References

Advisories & Patches

https://github.com/rclone/rclone/security/advisories/GHSA-35g6-9fjv-rmx5

Other References

https://www.vulncheck.com/advisories/rclone-1.68.0-before-1.75.2-authorization-bypass-in-serve-s3-multipart-uploads

Frequently Asked Questions

What is CVE-2026-116187? +

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. It has a CVSS v3.1 base score of 5.0 (MEDIUM).

How severe is CVE-2026-116187? +

CVE-2026-116187 has a CVSS v3.1 score of 5.0 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0014, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-116187? +

CVE-2026-116187 affects products from rclone, specifically: rclone. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-116187? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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