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CVE-2026-55189— RustFS: FTP frontend skips IAM authorization on object reads

Quick assessment

Affected
rustfs rustfs
Exploitation
Public or AI PoC available; prioritize validation
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组织开源的一个高性能对象存储系统。 RustFS 1.0.0-alpha.1至1.0.0-beta.8版本存在授权问题漏洞，该漏洞源于FTP读取和处理程序直接调度到存储后端而未调用IAM授权函数，可能导致任何能进行FTP身份验证的用户无视IAM策略读取任意存储桶中的任意对象。

CVSS 7.7 · High EPSS 0.34% · P25

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
rustfs rustfs >= 1.0.0-alpha.1, <= 1.0.0-beta.8 affected
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I. Basic Information for CVE-2026-55189

Vulnerability Information
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Vulnerability Title
RustFS: FTP frontend skips IAM authorization on object reads
Source: CVE Program / CVE List V5
Vulnerability Description
RustFS is a distributed object storage system built in Rust. From 1.0.0-alpha.1 until 1.0.0-beta.9, when the FTP frontend is enabled, the FTP read and probe handlers dispatch directly to the storage backend without ever calling the IAM authorization function that the FTP write/list handlers (and the entire HTTP S3 path) use. As a result, any user who can authenticate to the FTP listener — including a user whose IAM policy contains an explicit Deny on s3:GetObject — can read (RETR) and stat (SIZE/MDTM) any object in any bucket, and probe any bucket (CWD), completely regardless of their IAM policy. This vulnerability is fixed in 1.0.0-beta.9.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
RustFS 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
rustfs是RustFS组织开源的一个高性能对象存储系统。 RustFS 1.0.0-alpha.1至1.0.0-beta.8版本存在授权问题漏洞，该漏洞源于FTP读取和处理程序直接调度到存储后端而未调用IAM授权函数，可能导致任何能进行FTP身份验证的用户无视IAM策略读取任意存储桶中的任意对象。
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 >= 1.0.0-alpha.1, <= 1.0.0-beta.8 -

II. Public POCs for CVE-2026-55189

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 7497 chars
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III. Intelligence Information for CVE-2026-55189

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Vendor Advisories for CVE-2026-55189 (1)

Same Patch Batch · rustfs · 2026-06-26 · 4 CVEs total

CVE-2026-49991 8.6 HIGH RustFS Snowball Auto-Extract: Path Traversal allows cross-bucket object injection
CVE-2026-55188 8.2 HIGH RustFS: ListRemoteTargetHandler authorization bypass leaks replication target credentials
CVE-2026-55838 4.3 MEDIUM RustFS: Missing admin authorization on /rustfs/admin/v3/metrics allows any authenticated u

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-55189

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