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CVE-2025-31489— MinIO performs incomplete signature validation for unsigned-trailer uploads

Quick assessment

Affected
minio minio
Exploitation
Public or AI PoC available; prioritize validation
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存在数据伪造问题漏洞，该漏洞源于授权签名组件可能无效，可能导致任意对象上传。

AI Predicted 7.5 Difficulty: Easy EPSS 2.47% · P84

Public Exploits 1

Nuclei · 1 CVE-2025-31489.yaml [template]

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-31489

Vulnerability Information
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Vulnerability Title
MinIO performs incomplete signature validation for unsigned-trailer uploads
Source: CVE Program / CVE List V5
Vulnerability Description
MinIO is a High Performance Object Storage released under GNU Affero General Public License v3.0. The signature component of the authorization may be invalid, which would mean that as a client you can use any arbitrary secret to upload objects given the user already has prior WRITE permissions on the bucket. Prior knowledge of access-key, and bucket name this user might have access to - and an access-key with a WRITE permissions is necessary. However with relevant information in place, uploading random objects to buckets is trivial and easy via curl. This issue is fixed in RELEASE.2025-04-03T14-56-28Z.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
MinIO 数据伪造问题漏洞
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存在数据伪造问题漏洞，该漏洞源于授权签名组件可能无效，可能导致任意对象上传。
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

Vendor Product Affected Versions CPE Subscribe
minio minio < RELEASE.2025-04-03T14-56-28Z -

II. Public POCs for CVE-2025-31489

# POC Description Source Link Shenlong Link
1 MinIO is a High Performance Object Storage released under GNU Affero General Public License v3.0. The signature component of the authorization may be invalid, which would mean that as a client you can use any arbitrary secret to upload objects given the user already has prior WRITE permissions on the bucket. Prior knowledge of access-key, and bucket name this user might have access to - and an access-key with a WRITE permissions is necessary. However with relevant information in place, uploading random objects to buckets is trivial and easy via curl. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-31489.yaml POC Details
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III. Intelligence Information for CVE-2025-31489

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IV. Related Vulnerabilities

Same product: minio
Same vendor: minio
Same weakness: CWE-347

V. Comments for CVE-2025-31489

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