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MLflow < 3.8.0 Authentication Bypass (ZDI-26-111)

critical Nessus Plugin ID 299880

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Synopsis

The remote host is affected by an authentication bypass vulnerability.

Description

The version of MLflow installed on the remote host is prior to 3.8.0. It is, therefore, affected by an authentication bypass vulnerability:

 - A use of default password vulnerability exists in the basic_auth.ini file. The file contains hard-coded default credentials that allow remote, unauthenticated attackers to bypass authentication and execute arbitrary code in the context of the administrator. (CVE-2026-2635)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to MLflow version 3.8.0 or later.

See Also

https://www.zerodayinitiative.com/advisories/ZDI-26-111/

Plugin Details

Severity: Critical

ID: 299880

File Name: mlflow_CVE-2026-2635.nasl

Version: 1.1

Type: combined

Published: 2/24/2026

Updated: 2/24/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Critical

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-2635

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vulnerability Information

CPE: cpe:/a:lfprojects:mlflow

Required KB Items: installed_sw/MLflow

Patch Publication Date: 2/19/2026

Vulnerability Publication Date: 2/19/2026

Reference Information

CVE: CVE-2026-2635