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🛡️ CVE-2026-33322 — minio

🔴 CVSS 9.5 — Critical ✅ No Known Exploit CWE-287 OSV
9.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

MinIO has JWT Algorithm Confusion in OIDC Authentication

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](https://dl.min.io/aistor/minio/release/linux-amd64/minio) |

| Linux | arm64 | [minio](https://dl.min.io/aistor/minio/release/linux-arm64/minio) |

| macOS | arm64 | [minio](https://dl.min.io/aistor/minio/release/darwin-arm64/minio) |

| macOS | amd64 | [minio](https://dl.min.io/aistor/minio/release/darwin-amd64/minio) |

| Windows | amd64 | [minio.exe](https://dl.min.io/aistor/minio/release/windows-amd64/minio.exe) |

FIPS Binaries

| Platform | Architecture | Download |

| -------- | ------------ | --------------------------------------------------------------------------- |

| Linux | amd64 | [minio.fips](https://dl.min.io/aistor/minio/release/linux-amd64/minio.fips) |

| Linux | arm64 | [minio.fips](https://dl.min.io/aistor/minio/release/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](https://dl.min.io/aistor/minio/release/linux-arm64/minio-20260317212516.0.0-1.aarch64.rpm) |

Container Images

```bash

# 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)

```bash

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.](https://docs.min.io/enterprise/aistor-object-store/upgrade-aistor-server/community-edition/)
  • As a workaround, ensure that the OIDC ClientSecret is treated as a highly sensitive credential and is not exposed to untrusted parties.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. Rated impact: confidentiality high, integrity high, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Attack requirements: Present — the target has to be in a particular state for the attack to work.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: None — nobody has to be tricked into anything.
  • Confidentiality impact: High — total loss, or loss the attacker controls.
  • Integrity impact: High — total loss, or loss the attacker controls.
  • Availability impact: High — total loss, or loss the attacker controls.

Weakness class

CVE-2026-33322 is classified as CWE-287: Improper Authentication. The identity of the caller is not established correctly, so an attacker can act as another user.

Affected software

CVE-2026-33322 is recorded against 2 packages.

  • github.com/minio/minio
  • minio

Timeline and source

Published on 23 March 2026 and last revised on 3 June 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

github.com (Advisory)

Other advisories for this package

github.com/minio/minio has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-287: Improper Authentication) in other software:

Details

Severity CRITICAL
CVSS Score 9.5
CVSS Vector CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CWE CWE-287
Public Exploit ✅ No
Source OSV
Published 2026-03-23
Updated 2026-08-20
Modified 2026-06-03
Fix URL N/A

Affected Packages

Software From version Fixed in
github.com/minio/minio — —
minio — —

Exploit Protection

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CVE-2026-33322 carries CVSS 9.5 Critical rating. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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