Authorization Bypass in mlflow/mlflow

{
  "id": "695b358a33c0c34236474b490c8eaabc569074932ffbf9a9371fe5899634f272",
  "url": "https://osv.dev/vulnerability/CVE-2026-8147",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Authorization Bypass in mlflow/mlflow",
    "summary": "In MLflow versions prior to 3.14.0, when running with authentication enabled, the trace API endpoints lack proper authorization validators. This allows any authenticated user to bypass experiment-level authorization controls on all trace operations, including reading, deleting, and modifying traces on experiments they do not have permission to access. The issue arises from the `_before_request` handler, which does not register authorization validators for trace endpoints, resulting in requests proceeding without validation. This vulnerability can expose sensitive data, destroy audit logs, and allow unauthorized modifications.",
    "evidence": "osv:CVE-2026-8147",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-8147",
      "aliases": [
        "BIT-mlflow-2026-8147",
        "CVE-2026-8147",
        "GHSA-2cm6-r77w-6g96",
        "PYSEC-2026-3686"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/mlflow/mlflow",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "86cd7f5a1dc25a1387ad07c87811bbc30f62951c"
                },
                {
                  "fixed": "f9b1eb510478570609ef451984a255775aa4b937"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:lfprojects:mlflow:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.14.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "f9b1eb510478570609ef451984a255775aa4b937"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "ts/v0.2.0-rc.2",
            "ts/v0.2.0-rc.1",
            "model-catalog/latest",
            "nightly",
            "v3.0.0",
            "v2.2.0",
            "v1.7.0",
            "1.0.0",
            "v0.8.1",
            "v0.8.0",
            "v0.7",
            "v0.6.0",
            "v0.5.0",
            "v0.4.2",
            "v0.4.1",
            "v0.4.0",
            "v0.3.0",
            "v0.2.1",
            "v0.2.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-8147.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.879415384Z",
      "provider": "osv",
      "references": [
        "https://huntr.com/bounties/b00c3ddd-373e-492f-9bf0-41a28bb21ed5",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8147.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-8147",
        "https://github.com/mlflow/mlflow/commit/f9b1eb510478570609ef451984a255775aa4b937"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-284"
        ],
        "cna_assigner": "@huntr_ai",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8147.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-8147",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 492569,
  "published_at": "2026-07-02T07:32:58.308+00:00"
}