CVE-2026-0545 PoC — Missing Authentication for Critical Function in mlflow/mlflow

Title:Missing Authentication for Critical Function in mlflow/mlflow (CVE-2026-0545)
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.

MLflow latest version contains an authentication bypass caused by unprotected FastAPI job endpoints under /ajax-api/3.0/jobs/* when basic-auth is enabled, letting unauthenticated network clients submit and manage jobs, exploit requires job execution enabled and allowlisted job functions.

 id: CVE-2026-0545

info:
  name: MLflow Job API - Authentication Bypass
  author: DhiyaneshDk
  seve

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