GHSA-46R5-X6JQ-V8G6

Vulnerability from github – Published: 2026-04-07 15:30 – Updated: 2026-06-06 00:57
VLAI
Summary
MLflow is vulnerable to an authorization bypass affecting the AJAX endpoint
Details

MLflow is vulnerable to an authorization bypass affecting the AJAX endpoint used to download saved model artifacts. Due to missing access‑control validation, a user without permissions to a given experiment can directly query this endpoint and retrieve model artifacts they are not authorized to access.

This issue affects MLflow version through 3.10.1

Severity
4.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
5.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 3.10.1"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "mlflow"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.11.0rc0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-33866"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-862"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-08T00:18:40Z",
    "nvd_published_at": "2026-04-07T13:16:47Z",
    "severity": "MODERATE"
  },
  "details": "MLflow is vulnerable to an authorization bypass affecting the AJAX endpoint used to download saved model artifacts. Due to missing access\u2011control validation, a user without permissions to a given experiment can directly query this endpoint and retrieve model artifacts they are not authorized to access.\n\n \nThis issue affects MLflow version through 3.10.1",
  "id": "GHSA-46r5-x6jq-v8g6",
  "modified": "2026-06-06T00:57:58Z",
  "published": "2026-04-07T15:30:50Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33866"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mlflow/mlflow/pull/21708"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mlflow/mlflow/commit/005b959cacda05d1423356cfcbd9ebeda8ff96a7"
    },
    {
      "type": "WEB",
      "url": "https://afine.com/blogs/attacking-mlflow-how-ml-artifacts-become-attack-vectors"
    },
    {
      "type": "WEB",
      "url": "https://cert.pl/en/posts/2026/04/CVE-2026-33865"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/mlflow/mlflow"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/mlflow/PYSEC-2026-94.yaml"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "MLflow is vulnerable to an authorization bypass affecting the AJAX endpoint"
}



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