CVE-2026-2635: MLflow Use of Default Password Authentication Bypass Vulnerability

Severity: high (CVSS 7.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-02-20 · updated 2026-07-15
Weakness: CWE-1393

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

mlflow/mlflow: 3.4.0

References

https://github.com/mlflow/mlflow/pull/19260
https://www.zerodayinitiative.com/advisories/ZDI-26-111/
https://access.redhat.com/security/cve/CVE-2026-2635
https://bugzilla.redhat.com/show_bug.cgi?id=2441514
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2635.json

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