What is CVE-2026-33322?

CVE-2026-33322 is a critical-severity vulnerability in Minio, classified under Improper Authentication. CVSS score: 9.8/10. Published 2026-03-24.

How severe is CVE-2026-33322?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Minio

CVE-2026-33322

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.

Vulnerability class: Broken Authentication

EPSS: 0.004 (33.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Minio — versions >= RELEASE.2022-11-08T05-27-07Z, < RELEASE.2026-03-17T21-25-16Z

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2026-33322?: CVE-2026-33322 is a critical-severity vulnerability in Minio, classified under Improper Authentication. CVSS score: 9.8/10. Published 2026-03-24.
How severe is CVE-2026-33322?: Critical severity. CVSS v3 base score is 9.8 out of 10.