MLflow Weak Password Requirements Authentication Bypass Vulnerability

Vulnerability Details

This vulnerability allows remote attackers to bypass authentication on affected installations of MLflow. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the handling of passwords. The issue results from weak password requirements. An attacker can leverage this vulnerability to bypass authentication on the system.

Additional Details

MLflow has issued an update to correct this vulnerability. More details can be found at:
https://github.com/mlflow/mlflow/commit/1f74f3f24d8273927b8db392c23e108576936c54

Disclosure Timeline

• 2025-04-09 - Vulnerability reported to vendor
• 2025-10-03 - Coordinated public release of advisory
• 2025-10-03 - Advisory Updated

Credit

Peter Girnus (@gothburz) of Trend Zero Day Initiative

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