CVE-2026-2652: Authentication Bypass in mlflow/mlflow
mlflow · mlflow/mlflow
Vendor fix available · Affected: mlflow/mlflow · Exploitation: check available, not yet exploited
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 97% of scored CVEs
DescriptionCVE.org
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.
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- mlflow · mlflow/mlflowbefore 3.10.0
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Check available, not yet exploited. A public nuclei template can confirm it on a system you are authorised to test.
- CISA KEV
- Not listed
- Public check
- MLflow < 3.10.0 - Authentication Bypass on FastAPI Routes · nuclei template in projectdiscovery/nuclei-templates
- Vendor
- mlflow
- Published
- May 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-2652 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.