CVE-2026-33322 PUBLISHED

MinIO: JWT Algorithm Confusion in OIDC Authentication

Assigner: GitHub_M
Reserved: 18.03.2026 Published: 24.03.2026 Updated: 25.03.2026

MinIO is a high-performance object storage system. From RELEASE.2022-11-08T05-27-07Z to before RELEASE.2026-03-17T21-25-16Z, 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. This issue has been patched in RELEASE.2026-03-17T21-25-16Z.

Metrics

CVSS 4.0

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
CVSS Score: 9.2

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	Present	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	minio
Product	minio
Versions	Version >= RELEASE.2022-11-08T05-27-07Z, < RELEASE.2026-03-17T21-25-16Z is affected

References

https://github.com/minio/minio/security/advisories/GHSA-5cx5-wh4m-82fh

Problem Types

CWE-287: Improper Authentication CWE