CVE-2026-55838Public exploitNetwork attack vector

Authenticated metrics disclosure via omitted admin check

Published Jun 26, 2026 · Updated Jun 26, 2026

Missing authorization in RustFS 1.0.0-beta.8 and earlier allows remote authenticated users to read server-wide operational metrics. The MetricsHandler verifies only that credentials exist, then collects metrics without calling validate_admin_request for an admin action. Any valid IAM account can reach the HTTP endpoint, exposing disk I/O, network throughput, scanner timing, and cluster RPC state without granting data modification or service interruption.

CVSS severity4.3
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in RustFS 1.0.0-beta.8 and earlier allows remote authenticated users to read server-wide operational metrics. The MetricsHandler verifies only that credentials exist, then collects metrics without calling validate_admin_request for an admin action. Any valid IAM account can reach the HTTP endpoint, exposing disk I/O, network throughput, scanner timing, and cluster RPC state without granting data modification or service interruption.

The record

CVE
CVE-2026-55838
Published
Jun 26, 2026
Updated
Jun 26, 2026
Vendor
RustFS
Product
RustFS
Classifications
CWE-862, T1082
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 1.0.0-beta.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

RustFS · RustFSversion=<= 1.0.0-beta.7

Published CVSS scores

4.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-862Missing Authorization
T1082System Information Discovery

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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