Critical severity · published Mar 24, 2026
CVE-2026-33322
MinIO: JWT Algorithm Confusion in OIDC Authentication
9.8
CVSS
0.4%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 37% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MI
minio · minio
>= RELEASE.2022-11-08T05-27-07Z, < RELEASE.2026-03-17T21-25-16Z · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33322
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-33322
Vendor Advisory
https://github.com/minio/minio/security/advisories/GHSA-5cx5-wh4m-82fh
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