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.
Metrics
Affected Vendors & Products
| Vendors | Products |
|---|---|
| Minio |
|
No data.
No data.
References
History
Thu, 23 Oct 2025 19:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| References |
|
Mon, 20 Oct 2025 13:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Minio
Minio minio |
|
| Vendors & Products |
Minio
Minio minio |
Fri, 17 Oct 2025 14:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Thu, 16 Oct 2025 21:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | MinIO vulnerable to privilege escalation via session policy bypass in service accounts and STS | |
| Weaknesses | CWE-863 | |
| References |
| |
| Metrics |
cvssV3_1
|
MITRE
Status: PUBLISHED
Assigner: GitHub_M
Published: 2025-10-16T21:17:28.219Z
Updated: 2025-10-23T19:03:46.367Z
Reserved: 2025-10-15T15:03:28.133Z
Link: CVE-2025-62506
Vulnrichment
Updated: 2025-10-23T19:03:46.367Z
NVD
Status : Awaiting Analysis
Published: 2025-10-16T22:15:31.703
Modified: 2025-10-23T19:15:51.153
Link: CVE-2025-62506
Redhat
No data.