MinIO OIDC JWT algorithm confusion enabling token forgery
CVE-2026-33322 Published on March 24, 2026
MinIO: JWT Algorithm Confusion in OIDC Authentication
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.
Weakness Type
What is an authentification Vulnerability?
When an actor claims to have a given identity, the software does not prove or insufficiently proves that the claim is correct.
CVE-2026-33322 has been classified to as an authentification vulnerability or weakness.
Products Associated with CVE-2026-33322
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Affected Versions
minio Version >= RELEASE.2022-11-08T05-27-07Z, < RELEASE.2026-03-17T21-25-16Z is affected by CVE-2026-33322Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.