CVSS 3.0
8.6 highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:LCVE-2026-2652
High (8.6) in lfprojects mlflow. EPSS 21% chance of exploitation in the next 30 days. Fixed in mlflow 3.10.0, 3.11.0.
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.
Severity
- EPSS
- 21% chance of exploitation in the next 30 days; higher than 97% of CVEs (scores of 2026-10-31)
- CWE
- CWE-305
- Published
- Modified
- Record from
- the NVD, synced
Affected
- lfprojects:mlflow
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-75cm-x2w3-8mgf | PyPI | mlflow | <3.11.0 | 3.11.0 |
| PYSEC-2026-2221 | PyPI | mlflow | <3.10.0 | 3.10.0 |