What’s Vulnerable › Vulnerabilities
CVE-2026-33322: MinIO: JWT Algorithm Confusion in OIDC Authentication
- Severity: critical (CVSS 9.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-03-24 · updated 2026-06-17
- Weakness: CWE-287
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.
Affected products
- minio: from 2022-11-08t05-27-07z before 2026-03-17t21-25-16z — fixed in 2026-03-17t21-25-16z
How to fix
Upgrade to a fixed version: minio 2026-03-17t21-25-16z. Check the vendor advisory for mitigations.
References
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