Bug 2477767 (CVE-2026-2652)

Summary: CVE-2026-2652 mlflow: mlflow: Authentication bypass allows unauthorized job management and data injection
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in mlflow. When the mlflow server is configured with basic authentication and served via uvicorn, an architectural mismatch in the FastAPI permission middleware allows unauthenticated remote attackers to bypass authentication on specific routes. This bypass enables attackers to submit and cancel jobs, read job results, and inject arbitrary trace data into experiments, leading to unauthorized access and potential data manipulation.
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Description OSIDB Bzimport 2026-05-15 03:03:21 UTC 
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.