Missing Authentication for Critical Function in mlflow/mlflow_CVE-2026-0545

9.1 / 10

CRITICAL

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

Description

In mlflow/mlflow, the FastAPI job endpoints under `/ajax-api/3.0/jobs/*` are not protected by authentication or authorization when the `basic-auth` app is enabled. This vulnerability affects the latest version of the repository. If job execution is enabled (`MLFLOW_SERVER_ENABLE_JOB_EXECUTION=true`) and any job function is allowlisted, any network client can submit, read, search, and cancel jobs without credentials, bypassing basic-auth entirely. This can lead to unauthenticated remote code execution if allowed jobs perform privileged actions such as shell execution or filesystem changes. Even if jobs are deemed safe, this still constitutes an authentication bypass, potentially resulting in job spam, denial of service (DoS), or data exposure in job results.

Basic Information

ID CVE-2026-0545

Source @huntr_ai

Published Apr 3, 2026 at 17:03

Modified Apr 3, 2026 at 17:49

Affected Product

Vendor mlflow

Product mlflow/mlflow

Version unspecified

Affected Versions mlflow mlflow/mlflow unspecified

CWE Classification

CWE-306

References

huntr.com /bounties/b2e5b028-9541-4d29-8703-a76f1a3734d8

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