CVE-2026-2652HIGH 8.6EPSS p67.1%

CVE-2026-2652CVE-2026-2652

Description

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.

Scoring

CVSS 3.08.6 (HIGH)
VectorCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L
EPSS1.32% probability of exploitation · percentile 67.1% · 2026-06-19T12:03:05Z
Published2026-05-15
Last modified2026-05-18

Underlying weaknesses· 1

CWE-305

References

  1. https://github.com/mlflow/mlflow/commit/bb62e773263c14e9ba4d1a82fe72d0de2442c6aa
  2. https://huntr.com/bounties/5aeff5f0-49c7-4180-b5cb-c9a046f16756
  3. https://huntr.com/bounties/5aeff5f0-49c7-4180-b5cb-c9a046f16756

1

TypeTargetConfidenceTier
WeaknessAuthentication Bypass by Primary Weaknesscwe-3050%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.