CVE-2026-2635: mlflow Use of Default Password

Vulnerability summary

CVE-2026-2635 is a critical (CVSS 9.8) Use of Default Password vulnerability in mlflow. EPSS estimates a 1.36% chance of exploitation in the next 30 days, higher than 71.2% of scored vulnerabilities.

Timeline

1. 20-02-2026
   PublishedVulnerability first disclosed.
2. 15-07-2026
   Last modifiedVulnerability information updated.

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.

• CWE-1393Use of Default PasswordThe product uses default passwords for potentially critical functionality.
• CWE-798Use of Hard-coded CredentialsThe product contains hard-coded credentials, such as a password or cryptographic key.