Vulnerability · Published Mar 24, 2026 · Assigned by GitHub_M

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

Critical 9.2

In plain English

A critical-severity improper authentication in minio from minio. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities).

Severity (CVSS 4.0)9.2Critical

Exploit odds (30 days)0.4%top 63.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/minio/minio	no fix listed	GHSA-5cx5-wh4m-82fh
Go	github.com/minio/minio	no fix listed	GO-2026-4779

Affected products (as reported)

Vendor	Product	Versions
minio	minio	>= RELEASE.2022-11-08T05-27-07Z, < RELEASE.2026-03-17T21-25-16Z

Weakness: CWE-287 · 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

References

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