CVE-2026-8147 Authorization Bypass in mlflow/mlflow
Authenticated users can bypass authorization checks to read, modify, or delete traces in unauthorized MLflow experiments when authentication is enabled.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-8147?
CVE-2026-8147 is a high-severity missing authorization vulnerability in Lfprojects Mlflow, published on 2 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
In MLflow versions prior to 3.14.0, 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.
Weakness: CWE-284
Which versions are affected by CVE-2026-8147?
4 open source packages ship an affected version, including mlflow. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
mlflow Bitnami | All versions | 3.14.0 |
mlflow PyPI | From 2.14.0rc0 | 3.13.0rc0 |
mlflow PyPI | From 2.14.0rc0 | 3.13.0rc0 |
mlflow PyPI | From 2.14.0rc0 | 3.13.0rc0 |
Products include Lfprojects Mlflow.
How do I fix CVE-2026-8147?
Upgrade mlflow to a fixed version for your release line: 3.14.0 or 3.13.0rc0.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-8147 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-8147 exists.
Other vulnerabilities in Lfprojects Mlflow
- CVE-2026-64849 MLflow Server-Side Request Forgery
- CVE-2025-15379 Command Injection in mlflow/mlflow
- CVE-2024-0520 Remote Code Execution due to Full Controlled File Write in mlflow/mlflow
- CVE-2023-6977 Path Traversal: '\..\filename'
- CVE-2023-6709 Improper Neutralization of Special Elements Used in a Template Engine in mlflow/mlflow
Sources
Also known as BIT-mlflow-2026-8147, CLSA-2026-1788442606, GHSA-2cm6-r77w-6g96, PYSEC-2026-3686.