CVE-2021-41266Network attack vector

Unauthenticated console access via external IDP bypass

Published Nov 15, 2021 · Updated Aug 4, 2024

Authentication bypass in MinIO Console before 0.12.3 allows remote attackers to access console functions via external IDP authentication. When external IDP authentication is enabled, the Operator Console fails to enforce authentication and lets unauthenticated requests reach administrative functions. Exploitation requires the external identity provider integration; successful access can expose or alter console-managed resources, while no in-the-wild exploitation was reported.

CVSS severity8.6
High
EPSS probability48.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in MinIO Console before 0.12.3 allows remote attackers to access console functions via external IDP authentication. When external IDP authentication is enabled, the Operator Console fails to enforce authentication and lets unauthenticated requests reach administrative functions. Exploitation requires the external identity provider integration; successful access can expose or alter console-managed resources, while no in-the-wild exploitation was reported.

The record

CVE
CVE-2021-41266
Published
Nov 15, 2021
Updated
Aug 4, 2024
Vendor
MinIO
Product
MinIO Console
Classifications
CWE-306, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 15, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record 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=< 0.12.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MinIO · MinIO Consoleversion=< 0.12.3

Published CVSS scores

8.6GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L

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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T1190Exploit Public-Facing Application

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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