CVE-2026-33322— MinIO: JWT Algorithm Confusion in OIDC Authentication
Quick assessment
Affected
minio minio
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
MinIO是美国MinIO公司的一款开源的对象存储服务器。该产品支持构建用于机器学习、分析和应用程序数据工作负载的基础架构。 MinIO RELEASE.2022-11-08T05-27-07Z至RELEASE.2026-03-17T21-25-16Z之前版本存在授权问题漏洞，该漏洞源于OpenID Connect身份验证存在JWT算法混淆，可能导致攻击者伪造任意身份令牌并获取任意策略的S3凭据。
Possible ATT&CK Techniques 3 AI
T1528 · Steal Application Access Token T1078.004 · Cloud Accounts T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-33322
Vulnerability Information
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Vulnerability Title
MinIO: JWT Algorithm Confusion in OIDC Authentication
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
MinIO 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MinIO是美国MinIO公司的一款开源的对象存储服务器。该产品支持构建用于机器学习、分析和应用程序数据工作负载的基础架构。 MinIO RELEASE.2022-11-08T05-27-07Z至RELEASE.2026-03-17T21-25-16Z之前版本存在授权问题漏洞，该漏洞源于OpenID Connect身份验证存在JWT算法混淆，可能导致攻击者伪造任意身份令牌并获取任意策略的S3凭据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-33322
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Vendor Advisories for CVE-2026-33322 (1)
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JWT Algorithm Confusion in OIDC Authentication · Advisory · minio/minio · GitHub x_refsource_CONFIRM
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Same weakness: CWE-287
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V. Comments for CVE-2026-33322
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