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CVE-2026-55838— RustFS: Missing admin authorization on /rustfs/admin/v3/metrics allows any authenticated user to read server metrics

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组织开源的一个高性能对象存储系统。 RustFS 1.0.0-beta.7及之前版本存在授权问题漏洞，该漏洞源于MetricsHandler跳过admin-action IAM检查，可能导致受限制的IAM用户读取服务器范围的运行指标。

CVSS 4.3 · Medium EPSS 0.27% · P17

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
rustfs rustfs <= 1.0.0-beta.7 affected
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I. Basic Information for CVE-2026-55838

Vulnerability Information
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Vulnerability Title
RustFS: Missing admin authorization on /rustfs/admin/v3/metrics allows any authenticated user to read server metrics
Source: CVE Program / CVE List V5
Vulnerability Description
RustFS is a distributed object storage system built in Rust. In 1.0.0-beta.7 and earlier, the real-time metrics endpoint at /rustfs/admin/v3/metrics is accessible to any valid IAM user regardless of their assigned policy. Every other admin handler in the codebase calls validate_admin_request to enforce admin-action IAM checks; the MetricsHandler skips this call entirely. A restricted IAM user whose policy grants only access to their own bucket can read server-wide operational metrics including disk I/O statistics, network throughput, scanner cycle timing, and cluster RPC state.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/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-beta.7及之前版本存在授权问题漏洞，该漏洞源于MetricsHandler跳过admin-action IAM检查，可能导致受限制的IAM用户读取服务器范围的运行指标。
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-beta.7 -

II. Public POCs for CVE-2026-55838

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III. Intelligence Information for CVE-2026-55838

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Vendor Advisories for CVE-2026-55838 (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-2026-55189 7.7 HIGH RustFS: FTP frontend skips IAM authorization on object reads

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-55838

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