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CVE-2026-39360— RustFS has an authorization bypass in multipart UploadPartCopy enables cross-bucket object exfiltration

Quick assessment

Affected
rustfs rustfs
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

rustfs是RustFS开源的一个高性能对象存储系统。 RustFS alpha.90之前版本存在安全漏洞，该漏洞源于多部分复制路径中缺少授权检查，可能导致低权限用户突破租户隔离。

AI Predicted 8.6 Difficulty: Easy EPSS 0.28% · P18

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System
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I. Basic Information for CVE-2026-39360

Vulnerability Information
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Vulnerability Title
RustFS has an authorization bypass in multipart UploadPartCopy enables cross-bucket object exfiltration
Source: CVE Program / CVE List V5
Vulnerability Description
RustFS is a distributed object storage system built in Rust. Prior to alpha.90, RustFS contains a missing authorization check in the multipart copy path (UploadPartCopy). A low-privileged user who cannot read objects from a victim bucket can still exfiltrate victim objects by copying them into an attacker-controlled multipart upload and completing the upload. This breaks tenant isolation in multi-user / multi-tenant deployments. This vulnerability is fixed in alpha.90.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
rustfs 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
rustfs是RustFS开源的一个高性能对象存储系统。 RustFS alpha.90之前版本存在安全漏洞，该漏洞源于多部分复制路径中缺少授权检查，可能导致低权限用户突破租户隔离。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
rustfs rustfs < alpha.90 -

II. Public POCs for CVE-2026-39360

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III. Intelligence Information for CVE-2026-39360

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Vendor Advisories for CVE-2026-39360 (1)

IV. Related Vulnerabilities

Same product: rustfs
Same vendor: rustfs
Same weakness: CWE-862

V. Comments for CVE-2026-39360

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