{"cve":"CVE-2026-2652","nvd":{"published":"2026-05-15T03:16:23.127","modified":"2026-06-17T10:31:28.180","status":"Analyzed","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.","cvss_v4":null,"cvss_v3":{"version":"3.0","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L","score":8.6},"cwes":["CWE-305"],"references":["https://github.com/mlflow/mlflow/commit/bb62e773263c14e9ba4d1a82fe72d0de2442c6aa","https://huntr.com/bounties/5aeff5f0-49c7-4180-b5cb-c9a046f16756","https://huntr.com/bounties/5aeff5f0-49c7-4180-b5cb-c9a046f16756"],"products":["lfprojects:mlflow"],"source":"nvd","synced_at":"2026-10-19T22:35:16.954578616+00:00"},"epss":{"cve":"CVE-2026-2652","score":0.20783,"percentile":0.97542,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-75cm-x2w3-8mgf","url":"https://osv.dev/vulnerability/GHSA-75cm-x2w3-8mgf","summary":"MLflow: unauthenticated access to certain FastAPI routes","modified":"2026-07-13T07:26:15.599841662Z","packages":[{"ecosystem":"PyPI","name":"mlflow","purl":"pkg:pypi/mlflow","ranges":["<3.11.0"],"fixed":["3.11.0"]}]},{"id":"PYSEC-2026-2221","url":"https://osv.dev/vulnerability/PYSEC-2026-2221","summary":"","modified":"2026-07-13T16:45:09.381556404Z","packages":[{"ecosystem":"PyPI","name":"mlflow","purl":"pkg:pypi/mlflow","ranges":["<3.10.0"],"fixed":["3.10.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}