Is this vulnerability remotely exploitable?

Yes, it can be remotely exploitable if an attacker has network access to the MinIO instance and knows the OIDC ClientSecret. With those conditions met, they can submit forged JWTs over standard authentication endpoints.

What level of access does an attacker need to exploit this issue?

The attacker must have: - Knowledge of the OIDC ClientSecret configured for MinIO, and - Network reachability to the MinIO service. No prior MinIO account or valid token is required once they possess the secret and exploit the algorithm confusion.

What is the safest general fix pattern for developers and operators?

The most robust fix pattern is to enforce strict JWT verification: - Allow only specific, expected signing algorithms. - Use asymmetric keys from the OIDC provider for token verification. - Validate issuer, audience, and other claims rigorously. Additionally, protect and rotate the OIDC ClientSecret, and avoid over-privileged default policies.

Severity:

CRITICAL RISK

(9.8)

JWT Algorithm Confusion Authentication Bypass (CWE-287) in MinIO OpenID Connect Integration

CVE-2026-33322

Published:

Mar 24, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

CRITICAL RISK

CRITICAL

(9.8)

OS Command Injection (CWE-78) in Totolink A7100RU CGI Handler setAccessDeviceCfg

Remote Code Execution on the Router

April 12, 2026

CWE-77;CWE-78

CRITICAL RISK

CRITICAL

(9.8)

OS Command Injection (CWE-78) in Totolink A7100RU CGI setLedCfg Handler

Remote Code Execution on the Router

April 12, 2026

Vulnerability Type

Category:

Authentication Bypass via JWT Algorithm Confusion

CWE:

CWE-287

Impact:

Full Authentication Bypass and Privilege Escalation

Severity:

CRITICAL RISK

(9.8)

CVSS Version:

3.1

Vulnerability Type

Category:

Authentication Bypass via JWT Algorithm Confusion

CWE:

CWE-287

Impact:

Full Authentication Bypass and Privilege Escalation

Severity:

CRITICAL RISK

(9.8)

CVSS Version:

3.1

Catch This CVE While Code Is Being Written

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Ask AI for summary of CodeAnt

JWT Algorithm Confusion Authentication Bypass (CWE-287) in MinIO OpenID Connect Integration

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

CRITICAL RISK

CRITICAL

(9.8)

OS Command Injection (CWE-78) in Totolink A7100RU CGI Handler setAccessDeviceCfg

CRITICAL RISK

CRITICAL

(9.8)

OS Command Injection (CWE-78) in Totolink A7100RU CGI setLedCfg Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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