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Vulnerability record · CVE-2021-43858 · published 27 December 2021

CVE-2021-43858: Minio improper privilege management vulnerability

Minio · Minio

MinIO is a Kubernetes native application for cloud storage. Prior to version `RELEASE.2021-12-27T07-23-18Z`, a malicious client can hand-craft an HTTP API call that allows for updating policy for a user and gaining higher privileges. The patch in version `RELEASE.2021-12-27T07-23-18Z` changes the accepted request body type and removes the ability to apply policy changes through this API. There is a workaround for this vulnerability: Changing passwords can be disabled by adding an explicit `Deny` rule to disable the API for users.

8.8 CVSS 3.1 High EPSS 35% · top 1.6% CWE-269 · Improper privilege managementCWE-863 · Incorrect authorization
8.8CVSS 3.1 base score, v2 6.5
35%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

Description

MinIO is a Kubernetes native application for cloud storage. Prior to version `RELEASE.2021-12-27T07-23-18Z`, a malicious client can hand-craft an HTTP API call that allows for updating policy for a user and gaining higher privileges. The patch in version `RELEASE.2021-12-27T07-23-18Z` changes the accepted request body type and removes the ability to apply policy changes through this API. There is a workaround for this vulnerability: Changing passwords can be disabled by adding an explicit `Deny` rule to disable the API for users.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/minio/minio/commit/5a96cbbeaabd0a82b0fe881378e7c21c85091abf PatchThird Party Advisory
https://github.com/minio/minio/pull/13976 PatchThird Party Advisory
https://github.com/minio/minio/pull/7949 PatchThird Party Advisory
https://github.com/minio/minio/releases/tag/RELEASE.2021-12-27T07-23-18Z Release NotesThird Party Advisory
https://github.com/minio/minio/security/advisories/GHSA-j6jc-jqqc-p6cx PatchThird Party Advisory
https://github.com/minio/minio/commit/5a96cbbeaabd0a82b0fe881378e7c21c85091abf PatchThird Party Advisory
https://github.com/minio/minio/pull/13976 PatchThird Party Advisory
https://github.com/minio/minio/pull/7949 PatchThird Party Advisory
https://github.com/minio/minio/releases/tag/RELEASE.2021-12-27T07-23-18Z Release NotesThird Party Advisory
https://github.com/minio/minio/security/advisories/GHSA-j6jc-jqqc-p6cx PatchThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-43858), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.