CVE-2021-43858

User privilege escalation in MinIO

HIGH
8.8
CVSS Score
Published: December 27, 2021 at 09:20 PM UTC
Updated: June 17, 2026 at 04:11 AM UTC
1 product affected across 1 vendorMinIO

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Severity
HIGH8.8
Exploit prediction
EPSS 35%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 2021-12-27t07-23-18zv < RELEASE.2021-12-27T07-23-18Z
Affected range stops below 2021-12-27t07-23-18z, so it looks safe — our inference, not a vendor statement
Affected range stops below RELEASE.2021-12-27T07-23-18Z, so it looks safe — our inference, not a vendor statement

References (5)

CVSS

8.8HIGHGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-269CWE-863

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