BaseFortify

Publication date: 2025-10-16

Last updated on: 2025-10-23

Assigner: GitHub, Inc.

Description

MinIO is a high-performance object storage system. In all versions prior to RELEASE.2025-10-15T17-29-55Z, a privilege escalation vulnerability allows service accounts and STS (Security Token Service) accounts with restricted session policies to bypass their inline policy restrictions when performing operations on their own account, specifically when creating new service accounts for the same user. The vulnerability exists in the IAM policy validation logic where the code incorrectly relied on the DenyOnly argument when validating session policies for restricted accounts. When a session policy is present, the system should validate that the action is allowed by the session policy, not just that it is not denied. An attacker with valid credentials for a restricted service or STS account can create a new service account for itself without policy restrictions, resulting in a new service account with full parent privileges instead of being restricted by the inline policy. This allows the attacker to access buckets and objects beyond their intended restrictions and modify, delete, or create objects outside their authorized scope. The vulnerability is fixed in version RELEASE.2025-10-15T17-29-55Z.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2025-10-16

Last Modified

2025-10-23

Generated

2026-07-06

AI Q&A

2025-10-17

EPSS Evaluated

2026-07-04

NVD

CVE-2025-62506

Affected Vendors & Products

Vendor	Product	Version / Range
minio	minio	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-863	The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

Attack-Flow Graph

Executive Summary

This vulnerability in MinIO allows service accounts and STS accounts with restricted session policies to bypass their policy restrictions when performing operations on their own account. Specifically, due to incorrect IAM policy validation logic, an attacker with valid credentials can create a new service account for themselves that inherits full parent privileges instead of being restricted. This means the attacker can access and modify buckets and objects beyond their authorized scope.

Impact Analysis

The vulnerability can lead to privilege escalation, allowing an attacker to gain unauthorized access to buckets and objects, and to modify, delete, or create objects outside their intended permissions. This can compromise data integrity and confidentiality within the MinIO object storage system.

Mitigation Strategies

Upgrade MinIO to version RELEASE.2025-10-15T17-29-55Z or later, as this version contains the fix for the privilege escalation vulnerability. Until the upgrade is applied, restrict the use of service accounts and STS accounts with restricted session policies to minimize risk.

Hi! I’m here to help you understand CVE-2025-62506. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70