CVE-2026-2652
Published:May 15, 2026
Updated:May 25, 2026
A vulnerability in mlflow/mlflow versions 3.9.0 and earlier allows unauthenticated access to certain FastAPI routes when the server is started with authentication enabled ("--app-name basic-auth") and served via uvicorn (ASGI). The FastAPI permission middleware only enforces authentication on "/gateway/" routes, leaving other routes such as the Job API ("/ajax-api/3.0/jobs/*") and the OpenTelemetry trace ingestion API ("/v1/traces") unprotected. This allows unauthenticated remote attackers to submit jobs, read job results, cancel running jobs, and inject arbitrary trace data into experiments. The issue arises from an architectural mismatch between Flask and FastAPI authentication mechanisms, where the "_find_fastapi_validator()" function fails to handle non-"/gateway/" paths, resulting in a complete authentication bypass. This vulnerability is fixed in version 3.10.0.
Affected Packages
mlflow (CONDA):
Affected version(s) >=0.9.0.1 <3.10.0Fix Suggestion:
Update to version 3.10.0https://github.com/mlflow/mlflow.git (GITHUB):
Affected version(s) >=v0.2.0 <v3.10.0Fix Suggestion:
Update to version v3.10.0mlflow (PYTHON):
Affected version(s) >=0.0.1 <3.10.0Fix Suggestion:
Update to version 3.10.0mlflow (PYTHON):
Affected version(s) >=0.0.1 <3.11.0Fix Suggestion:
Update to version 3.11.0Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.8
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
HIGH
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.6
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
HIGH
Availability
LOW
Weakness Type (CWE)
Authentication Bypass by Primary Weakness
EPSS
Base Score:
0.15