CVE-2025-62506
published 2025-10-16CVE-2025-62506: 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…
PriorityP353high8.1CVSS 3.1
AVNACLPRLUINSUCHIHAN
EPSS
0.52%
40.4th percentile
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.
Affected
3 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| github.com | minio_minio | >= 0 < 0.0.0-20251015170045-c1a49490c78e | 0.0.0-20251015170045-c1a49490c78e |
| minio | minio | < RELEASE.2025-10-15T17-29-55Z | RELEASE.2025-10-15T17-29-55Z |
| rustfs | rustfs | >= 1.0.0-alpha.13 < 1.0.0-alpha.79 | 1.0.0-alpha.79 |
CVSS provenance
nvdv3.18.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
ghsa8.1HIGH
osv8.1HIGH
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GHSA
RustFS has IAM deny_only Short-Circuit that Allows Privilege Escalation via Service Account Minting
ghsa·2026-01-08·CVSS 8.1
CVE-2026-22043 [HIGH] CWE-269 RustFS has IAM deny_only Short-Circuit that Allows Privilege Escalation via Service Account Minting
RustFS has IAM deny_only Short-Circuit that Allows Privilege Escalation via Service Account Minting
## Summary
A flawed `deny_only` short-circuit in RustFS IAM allows a restricted service account or STS credential to self-issue an unrestricted service account, inheriting the parent’s full privileges. This enables privilege escalation and bypass of session/inline policy restrictions.
## Details
**akin to MinIO CVE-2025-62506**
- Policy evaluation: `Policy::is_allowed` returns true when `deny_only=true` if no explicit Deny is hit, skipping all Allow checks (`crates/policy/src/policy/policy.rs:66-74`).
- Service account creation path sets `deny_only=true` when the target user equals the caller or its parent (`rustfs/src/admin/handlers/service_account.rs:114-127`).
- Service accounts are
OSV
RustFS has IAM deny_only Short-Circuit that Allows Privilege Escalation via Service Account Minting
osv·2026-01-08·CVSS 8.1
CVE-2026-22043 [HIGH] RustFS has IAM deny_only Short-Circuit that Allows Privilege Escalation via Service Account Minting
RustFS has IAM deny_only Short-Circuit that Allows Privilege Escalation via Service Account Minting
## Summary
A flawed `deny_only` short-circuit in RustFS IAM allows a restricted service account or STS credential to self-issue an unrestricted service account, inheriting the parent’s full privileges. This enables privilege escalation and bypass of session/inline policy restrictions.
## Details
**akin to MinIO CVE-2025-62506**
- Policy evaluation: `Policy::is_allowed` returns true when `deny_only=true` if no explicit Deny is hit, skipping all Allow checks (`crates/policy/src/policy/policy.rs:66-74`).
- Service account creation path sets `deny_only=true` when the target user equals the caller or its parent (`rustfs/src/admin/handlers/service_account.rs:114-127`).
- Service accounts are
OSV
MinIO is Vulnerable to Privilege Escalation via Session Policy Bypass in Service Accounts and STS in github.com/minio/minio
osv·2025-10-30
CVE-2025-62506 MinIO is Vulnerable to Privilege Escalation via Session Policy Bypass in Service Accounts and STS in github.com/minio/minio
MinIO is Vulnerable to Privilege Escalation via Session Policy Bypass in Service Accounts and STS in github.com/minio/minio
MinIO is Vulnerable to Privilege Escalation via Session Policy Bypass in Service Accounts and STS in github.com/minio/minio
GHSA
MinIO is Vulnerable to Privilege Escalation via Session Policy Bypass in Service Accounts and STS
ghsa·2025-10-16
CVE-2025-62506 [HIGH] CWE-863 MinIO is Vulnerable to Privilege Escalation via Session Policy Bypass in Service Accounts and STS
MinIO is Vulnerable to Privilege Escalation via Session Policy Bypass in Service Accounts and STS
### Summary
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.
### Details
The vulnerability exists in the IAM policy validation logic in `cmd/iam.go`. When validating session policies for restricted accounts performing operations on their own account (such as creating service accounts), the code incorrectly relied on the `DenyOnly` argument.
The `DenyOnly` flag is used to allow accounts to perform actions related to their own account by only checking if the
OSV
MinIO is Vulnerable to Privilege Escalation via Session Policy Bypass in Service Accounts and STS
osv·2025-10-16
CVE-2025-62506 [HIGH] MinIO is Vulnerable to Privilege Escalation via Session Policy Bypass in Service Accounts and STS
MinIO is Vulnerable to Privilege Escalation via Session Policy Bypass in Service Accounts and STS
### Summary
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.
### Details
The vulnerability exists in the IAM policy validation logic in `cmd/iam.go`. When validating session policies for restricted accounts performing operations on their own account (such as creating service accounts), the code incorrectly relied on the `DenyOnly` argument.
The `DenyOnly` flag is used to allow accounts to perform actions related to their own account by only checking if the
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
https://github.com/minio/minio/commit/c1a49490c78e9c3ebcad86ba0662319138ace190https://github.com/minio/minio/pull/21642https://github.com/minio/minio/security/advisories/GHSA-jjjj-jwhf-8rgrhttps://github.com/minio/minio/discussions/21655https://github.com/minio/minio/issues/21647https://news.ycombinator.com/item?id=45684035
2025-10-16
Published