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

Published · last modified .

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.

EPSS exploit prediction

EPSS: 0.006 (46.9th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 46.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-33322: held from 0.004 to 0.006.

EPSS over last 30 days · oldest: 0.004 · newest: 0.006 · change: +0.002

Affected products

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

Weakness classification (CWE)

References

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.