by Kastro
Paper/Archive/CVE-2026-33322

CVE-2026-33322

minio minio — MinIO: JWT Algorithm Confusion in OIDC Authentication

EPSS 0.4%CVSS 9.8
critical.is priorityof 100
37
CVSS 9.8 (NVD)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 36.9.369 × 207.4No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
minio>= RELEASE.2022-11-08T05-27-07Z, < RELEASE.2026-03-17T21-25-16Z–CNA

Scores by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GitHub_M (CNA)9.2CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refgithub.com/minio/minio/security/advisories/GHSA-5cx5-wh4m-82fh