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.

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the 511f5aac-ab46-11f0-9446-f02f7497ecda advisory.

    mino reports:
    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 own account           operations, specifically when creating new service accounts for the same           user.

Tenable has extracted the preceding description block directly from the FreeBSD security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2025-62506)

ID	Name	Product	Family	Severity
271196	FreeBSD : minio -- Privilege Escalation via Session Policy Bypass in Service Accounts and STS (511f5aac-ab46-11f0-9446-f02f7497ecda)	Nessus	FreeBSD Local Security Checks	high
435645	SCA: security update for github.com/minio/minio (GHSA-jjjj-jwhf-8rgr)	Tenable Cloud Security	SCA Checks	high
435645	SCA: security update for github.com/minio/minio (GHSA-jjjj-jwhf-8rgr)	Tenable Self-Hosted Container Security	SCA Checks	high

Detections

Analytics

CVE-2025-62506

high

Tenable Plugins

high

high

high