9.8

CVE-2026-33322: MinIO: JWT Algorithm Confusion in OIDC Authentication

Analyzed
AliasesCGA-5xqc-7w65-8f5vCGA-cffq-v9hx-ffqfGHSA-5cx5-wh4m-82fh
Published 24-03-2026Last modified 25-03-2026

Vulnerability summary

CVE-2026-33322 is a critical (CVSS 9.8) Improper Authentication vulnerability in minio. EPSS estimates a 0.63% chance of exploitation in the next 30 days, higher than 49.4% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
0.63%
0%100%
Low · +0.22 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 3
OPENSUSE-SU-2026:21483-1SUSE-SU-2026:1135-1CGA-2QFF-97Q5-MW64

Timeline

  1. 24-03-2026
    PublishedVulnerability first disclosed.
  2. 25-03-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

6 scores · 5 sources · 2 versions

EPSS trend

Probability

0.63%

Chance of exploitation in the next 30 days

Percentile

49%

Versus all other CVEs

30-day change

Increase +0.22 pp

From 0.41% on 22-09-2026

22-09-202622-10-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard2 products
  • minio< 0.20260604.005411-r0
  • minio-fips< 0.20260604.005411-r0
Github.com/minio1 product
  • minio≤ 0.0.0-20260212201848-7aac2a2c5b7c | All versions (No fix recorded)
Minio1 product
  • minio≥ RELEASE.2022-11-08T05-27-07Z, < RELEASE.2026-03-17T21-25-16Z | ≥ 2022-11-08t05-27-07z, < 2026-03-17t21-25-16z
Wolfi1 product
  • minio< 0.20260604.005411-r0

4 vendors · 5 products

References

3 links