MLflow authenticated users can enumerate any registered model versions due to lack of per-model permissions checks
Medium6.5CVE-2026-2734 · Published May 21, 2026 · updated Jul 13, 2026
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| mlflow PyPI | < 3.10.0 | 3.10.0 |
Details and references
In mlflow/mlflow versions up to 3.9.0, the `SearchModelVersions` REST API endpoint and the `mlflowSearchModelVersions` GraphQL query lack proper per-model authorization checks when basic authentication is enabled. This allows any authenticated user to enumerate all model versions across all registered models, regardless of their permission level. The issue arises due to the absence of `SearchModelVersions` in the `BEFORE_REQUEST_VALIDATORS` and `AFTER_REQUEST_HANDLERS` for the REST API, and its omission from `GraphQLAuthorizationMiddleware.PROTECTED_FIELDS` for GraphQL. This vulnerability can expose sensitive information such as model names, version descriptions, source URIs, tags, and other metadata, potentially revealing proprietary or confidential details in multi-tenant environments. The issue is resolved in version 3.10.0.
- CVSS 3.0
- CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- Severity from
- GitHub (reviewed advisory)
- Weakness
- CWE-284
- Also known as
- BIT-mlflow-2026-2734, CVE-2026-2734, PYSEC-2026-2660
More MLflow advisories
All MLflow| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| May 19 | MLflow: Improper Origin Validation in MLflow Assistant /ajax-api Endpoints Enables Browser-Mediated Local Command Execution CVE-2026-2611Critical9.6fixed in 3.10.0 | Critical9.6 | 3.10.0 |
| May 18 | MLFlow Creates a Temporary File With Insecure Permissions CVE-2026-4137High7.0fixed in 3.11.0 | High7.0 | 3.11.0 |
| May 26 | MLflow allows unauthorized access to multipart upload endpoints when the `--serve-artifacts` mode is enabled CVE-2026-2651Critical9.0fixed in 3.11.0rc1 | Critical9.0 | 3.11.0rc1 |
| May 15 | MLflow: unauthenticated access to certain FastAPI routes CVE-2026-2652High8.6fixed in 3.11.0 | High8.6 | 3.11.0 |
| May 11 | MLflow allows an unauthenticated remote attacker to read arbitrary files from the server's filesystem CVE-2026-2614High7.5fixed in 3.10.0 | High7.5 | 3.10.0 |
| May 11 | MLflow Has a Server-Side Request Forgery (SSRF) Vulnerability CVE-2026-2393High7.1fixed in 3.9.0 | High7.1 | 3.9.0 |