PYSEC-2026-3686
MLflow: trace API endpoints lack proper authorization validators
At a glance
- Published
- Updated
- CVE
- CVE-2026-8147
- Aliases
- BIT-mlflow-2026-8147, GHSA-2cm6-r77w-6g96
- CVSS_V3
- CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Description
In MLflow versions prior to 3.13.0, when running with authentication enabled, the trace API endpoints lack proper authorization validators. This allows any authenticated user to bypass experiment-level authorization controls on all trace operations, including reading, deleting, and modifying traces on experiments they do not have permission to access. The issue arises from the `_before_request` handler, which does not register authorization validators for trace endpoints, resulting in requests proceeding without validation. This vulnerability can expose sensitive data, destroy audit logs, and allow unauthorized modifications.
Affected packages
| Package | Versions |
|---|---|
| PyPI · mlflow | introduced 2.14.0rc0, fixed 3.13.0rc0 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-8147 ADVISORY
- https://github.com/mlflow/mlflow/pull/23014 WEB
- https://github.com/mlflow/mlflow/commit/f9b1eb510478570609ef451984a255775aa4b937 WEB
- https://github.com/mlflow/mlflow PACKAGE
- https://github.com/mlflow/mlflow/releases/tag/v3.13.0 WEB
- https://huntr.com/bounties/b00c3ddd-373e-492f-9bf0-41a28bb21ed5 WEB
- https://pypi.org/project/mlflow PACKAGE
- https://github.com/advisories/GHSA-2cm6-r77w-6g96 ADVISORY
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — PyPA Advisory Database |