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Critical · 9.8 CVE-2026-2635 EUVD-2026-7766GHSA-gq3w-7jj3-x7grPYSEC-2026-421

MLflow Use of Default Password Authentication Bypass Vulnerability

Published Feb 20, 2026 · Updated Jul 15, 2026 · Assigned by zdi

Description

MLflow Use of Default Password Authentication Bypass Vulnerability. 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 basic_auth.ini file. The file contains hard-coded default credentials. An attacker can leverage this vulnerability to bypass authentication and execute arbitrary code in the context of the administrator. Was ZDI-CAN-28256.

Affected products

VendorProductAffectedFixed
MLflow MLflow 3.4.0 —

Affected packages

EcosystemPackageAffectedFixedRecord
PyPI mlflow < 3.8.0rc0 3.8.0rc0 GHSA-gq3w-7jj3-x7gr

References