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GHSA-5cx5-wh4m-82fh
No affected components available
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 | | DEB | arm64 | minio_20260317212516.0.0_arm64.deb | | RPM | 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/minioproject should upgrade to MinIO AIStorRELEASE.2026-03-17T21-25-16Zor later. - As a workaround, ensure that the OIDC
ClientSecretis treated as a highly sensitive credential and is not exposed to untrusted parties.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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