PT-2026-26481 · Go · Github.Com/Minio/Minio

Published 2026-03-19 · Updated 2026-03-19 · CVE-2026-33322

OSV

CVSS v4.0

9.2

Critical

AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Impact

What kind of vulnerability is it? Who is impacted?

A JWT algorithm confusion vulnerability in MinIO's OpenID Connect authentication allows an attacker who knows the OIDC ClientSecret to forge arbitrary identity tokens and obtain S3 credentials with any policy, including consoleAdmin.

An attacker with knowledge of the OIDC ClientSecret can:

• Impersonate any user identity
• Obtain S3 credentials with any IAM policy, including consoleAdmin
• Access, modify, or delete any data in the MinIO deployment

The attack is deterministic (100% success rate, no race conditions).

Attack Prerequisites

The attacker must know the OIDC ClientSecret. While this is a shared credential (not a private key), it is more accessible than commonly assumed:

• CVE-2023-28432 previously leaked environment variables including MINIO IDENTITY OPENID CLIENT SECRET
• Client secrets are often present in frontend OAuth configurations, mobile app bundles, CI/CD pipelines, and shared configuration files
• In many organizations, the client secret is accessible to operators and engineers who should not be able to forge arbitrary identities

Affected Versions

All MinIO releases from RELEASE.2022-11-08T05-27-07Z through the final release of the minio/minio open-source project.

Patches

Fixed in: MinIO AIStor RELEASE.2026-03-17T21-25-16Z

Downloads

Binary Downloads

Platform	Architecture	Download
Linux	amd64	minio
Linux	arm64	minio
macOS	arm64	minio
macOS	amd64	minio
Windows	amd64	minio.exe

FIPS Binaries

Platform	Architecture	Download
Linux	amd64	minio.fips
Linux	arm64	minio.fips

Package Downloads

Format	Architecture	Download
DEB	amd64	[minio 20260317212516.0.0 amd64.deb](https://dl.min.io/aistor/minio/release/linux-amd64/minio 20260317212516.0.0 amd64.deb)
DEB	arm64	[minio 20260317212516.0.0 arm64.deb](https://dl.min.io/aistor/minio/release/linux-arm64/minio 20260317212516.0.0 arm64.deb)
RPM	amd64	[minio-20260317212516.0.0-1.x86 64.rpm](https://dl.min.io/aistor/minio/release/linux-amd64/minio-20260317212516.0.0-1.x86 64.rpm)
RPM	arm64	minio-20260317212516.0.0-1.aarch64.rpm

Container Images

# Standard
docker pull quay.io/minio/aistor/minio:RELEASE.2026-03-17T21-25-16Z
podman pull quay.io/minio/aistor/minio:RELEASE.2026-03-17T21-25-16Z

# FIPS
docker pull quay.io/minio/aistor/minio:RELEASE.2026-03-17T21-25-16Z.fips
podman pull quay.io/minio/aistor/minio:RELEASE.2026-03-17T21-25-16Z.fips

Homebrew (macOS)

brew install minio/aistor/minio

Workarounds

• Users of the open-source minio/minio project should upgrade to MinIO AIStor RELEASE.2026-03-17T21-25-16Z or later.
• As a workaround, ensure that the OIDC ClientSecret is treated as a highly sensitive credential and is not exposed to untrusted parties.

Fix

Use of a Broken Cryptographic Algorithm

Weakness Enumeration

CWE-327

Related Identifiers

CVE-2026-33322

GHSA-5CX5-WH4M-82FH

Affected Products

Github.Com/Minio/Minio

References · 3

• https://osv.dev/vulnerability/GHSA-5cx5-wh4m-82fh · Vendor Advisory
• https://github.com/minio/minio · Note
• https://github.com/minio/minio/security/advisories/GHSA-5cx5-wh4m-82fh · Note