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    CVE-2026-2652

    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.

    Published:May 15, 2026
    Last Modified:May 18, 2026
    EPS:May 15, 2026
    EPSS Score:0.00087
    CVSS Score:8.6

    Affected Products

    Vendor
    Lfprojects
    Product
    Mlflow
    Vendor
    Mlflow
    Product
    Mlflow/mlflow

    Exploits

    https://huntr.com/bounties/5aeff5f0-49c7-4180-b5cb-c9a046f16756https://huntr.com/bounties/5aeff5f0-49c7-4180-b5cb-c9a046f16756

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
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    High
    User Interaction
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    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
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    Integrity
    None
    Low
    High
    Availability
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    Low
    High