CVE-2026-0545
Description
A flaw was found in mlflow/mlflow. When the basic-auth application is enabled, the FastAPI job endpoints are not protected by authentication or authorization. A remote attacker can exploit this by sending requests to these endpoints, bypassing security measures entirely. This can lead to unauthenticated remote code execution if allowed jobs perform privileged actions, or potentially result in job spam, denial of service (DoS), or data exposure.
Statement
This Important flaw in MLflow allows unauthenticated access to FastAPI job endpoints when basic-auth is enabled, bypassing security controls. A remote attacker could exploit this to achieve unauthenticated remote code execution if job execution is enabled and configured for privileged operations. This also poses risks of denial of service and data exposure.
Mitigation
To mitigate this issue, disable job execution on the MLflow server by setting the `MLFLOW_SERVER_ENABLE_JOB_EXECUTION` environment variable to `false`. This prevents unauthenticated access to job endpoints.
Example:
`MLFLOW_SERVER_ENABLE_JOB_EXECUTION=false mlflow server`
If configured as a service, update the service definition to include this environment variable. A restart of the MLflow server is required for the change to take effect.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 8.1 | 9.8 | 8.1 |
| Attack Vector | Network | Network | Network |
| Attack Complexity | High | Low | High |
| Privileges Required | None | None | None |
| User Interaction | None | None | None |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | High | High | High |
| Integrity Impact | High | High | High |
| Availability Impact | High | High | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
cve.org: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Access Control,Other
Technical Impact: Gain Privileges or Assume Identity; Varies by Context
Exposing critical functionality essentially provides an attacker with the privilege level of that functionality. The consequences will depend on the associated functionality, but they can range from reading or modifying sensitive data, accessing administrative or other privileged functionality, or possibly even executing arbitrary code.
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