CVE-2026-55838

MEDIUM

RustFS Metrics API - Authorization Bypass

Title source: manual
STIX 2.1

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.

References (1)

Core 1
Core References

Scores

CVSS v3 4.3
EPSS 0.0016
EPSS Percentile 5.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-862
Status published
Products (1)
rustfs/rustfs <= 1.0.0-beta.7
Published Jun 26, 2026
Tracked Since Jun 27, 2026