How severe is CVE-2026-33322?

CVE-2026-33322 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-33322 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33322?

CVE-2026-33322 affects Minio. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33322?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-33322 have an EU (EUVD) identifier?

Yes. CVE-2026-33322 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20095.

When was CVE-2026-33322 published?

CVE-2026-33322 was published on 2026-03-24 and last updated on 2026-06-17.

CVE-2026-33322

CVE-2026-33322 is a critical-severity vulnerability in Minio with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 9.2
EPSS exploit prediction: 0% (34th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-20095
Weakness: CWE-287
Affected product: Minio
Published: 2026-03-24
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-33322?: 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.
How severe is CVE-2026-33322?: CVE-2026-33322 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-33322 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33322?: CVE-2026-33322 affects Minio. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33322?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-33322 have an EU (EUVD) identifier?: Yes. CVE-2026-33322 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20095.
When was CVE-2026-33322 published?: CVE-2026-33322 was published on 2026-03-24 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:minio:minio:*:*:*:*:*:*:*:*

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