CVE-2026-55189Network attack vector

Authenticated object disclosure via missing FTP authorization

Published Jun 26, 2026 · Updated Jun 26, 2026

Missing authorization in RustFS 1.0.0-alpha.1 through 1.0.0-beta.8 allows remote authenticated users to read arbitrary objects over FTP. The get() and metadata() handlers in the FTP driver call the storage backend without the authorize_operation() gate used by protected handlers. Exploitation requires valid IAM credentials and an enabled FTP or FTPS frontend, after which denied users can read and inspect objects but cannot modify them through the proven path.

CVSS severity7.1
High
EPSS probability0.34%
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-alpha.1 through 1.0.0-beta.8 allows remote authenticated users to read arbitrary objects over FTP. The get() and metadata() handlers in the FTP driver call the storage backend without the authorize_operation() gate used by protected handlers. Exploitation requires valid IAM credentials and an enabled FTP or FTPS frontend, after which denied users can read and inspect objects but cannot modify them through the proven path.

The record

CVE
CVE-2026-55189
Published
Jun 26, 2026
Updated
Jun 26, 2026
Vendor
RustFS
Product
RustFS
Classifications
CWE-862, CWE-863, T1530
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-alpha.1, <= 1.0.0-beta.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

RustFS · RustFSversion=>= 1.0.0-alpha.1, <= 1.0.0-beta.8

Published CVSS scores

6.5RustFS GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
7.7RustFS GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
7.1RustFS GitHub Security AdvisoryCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
CWE-863Incorrect Authorization
T1530Data from Cloud Storage

Public exploit references

No public exploit references are available in this record.

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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