id: PYSEC-2026-2660
published: "2026-07-13T15:19:09.507843Z"
modified: "2026-07-13T16:04:54.077930Z"
aliases:
- CVE-2026-2734
- GHSA-w5xq-c4pf-ghq7
summary: MLflow authenticated users can enumerate any registered model versions due to lack of per-model permissions checks
details: In mlflow/mlflow versions up to 3.9.0, the `SearchModelVersions` REST API endpoint and the `mlflowSearchModelVersions` GraphQL query lack proper per-model authorization checks when basic authentication is enabled. This allows any authenticated user to enumerate all model versions across all registered models, regardless of their permission level. The issue arises due to the absence of `SearchModelVersions` in the `BEFORE_REQUEST_VALIDATORS` and `AFTER_REQUEST_HANDLERS` for the REST API, and its omission from `GraphQLAuthorizationMiddleware.PROTECTED_FIELDS` for GraphQL. This vulnerability can expose sensitive information such as model names, version descriptions, source URIs, tags, and other metadata, potentially revealing proprietary or confidential details in multi-tenant environments. The issue is resolved in version 3.10.0.
affected:
- package:
    name: mlflow
    ecosystem: PyPI
    purl: pkg:pypi/mlflow
  ranges:
  - type: ECOSYSTEM
    events:
    - introduced: "0"
    - fixed: 3.10.0
  versions:
  - 0.0.1
  - 0.1.0
  - 0.2.0
  - 0.2.1
  - 0.3.0
  - 0.4.0
  - 0.4.1
  - 0.4.2
  - 0.5.0
  - 0.5.1
  - 0.5.2
  - 0.6.0
  - 0.7.0
  - 0.8.0
  - 0.8.1
  - 0.8.2
  - 0.9.0
  - 0.9.0.1
  - 0.9.1
  - 1.0.0
  - 1.1.0
  - 1.1.1.dev0
  - 1.10.0
  - 1.11.0
  - 1.12.0
  - 1.12.1
  - "1.13"
  - 1.13.1
  - 1.14.0
  - 1.14.1
  - 1.15.0
  - 1.16.0
  - 1.17.0
  - 1.18.0
  - 1.19.0
  - 1.2.0
  - 1.20.0
  - 1.20.1
  - 1.20.2
  - 1.21.0
  - 1.22.0
  - 1.23.0
  - 1.23.1
  - 1.24.0
  - 1.25.0
  - 1.25.1
  - 1.26.0
  - 1.26.1
  - 1.27.0
  - 1.28.0
  - 1.29.0
  - 1.3.0
  - 1.30.0
  - 1.30.1
  - 1.4.0
  - 1.5.0
  - 1.6.0
  - 1.7.0
  - 1.7.1
  - 1.7.2
  - 1.8.0
  - 1.9.0
  - 1.9.1
  - 2.0.0
  - 2.0.0rc0
  - 2.0.1
  - 2.1.0
  - 2.1.1
  - 2.10.0
  - 2.10.1
  - 2.10.2
  - 2.11.0
  - 2.11.1
  - 2.11.2
  - 2.11.3
  - 2.11.4
  - 2.12.0
  - 2.12.1
  - 2.12.2
  - 2.13.0
  - 2.13.1
  - 2.13.2
  - 2.14.0
  - 2.14.0rc0
  - 2.14.1
  - 2.14.2
  - 2.14.2.dev0
  - 2.14.3
  - 2.15.0
  - 2.15.0rc0
  - 2.15.1
  - 2.16.0
  - 2.16.1
  - 2.16.2
  - 2.17.0
  - 2.17.0rc0
  - 2.17.1
  - 2.17.2
  - 2.18.0
  - 2.18.0rc0
  - 2.19.0
  - 2.19.0rc0
  - 2.2.0
  - 2.2.1
  - 2.2.2
  - 2.20.0
  - 2.20.0rc0
  - 2.20.1
  - 2.20.2
  - 2.20.3
  - 2.20.4
  - 2.21.0
  - 2.21.0rc0
  - 2.21.1
  - 2.21.2
  - 2.21.3
  - 2.22.0
  - 2.22.0rc0
  - 2.22.1
  - 2.22.2
  - 2.22.3
  - 2.22.4
  - 2.22.5
  - 2.3.0
  - 2.3.1
  - 2.3.2
  - 2.4.0
  - 2.4.1
  - 2.4.2
  - 2.5.0
  - 2.6.0
  - 2.7.0
  - 2.7.1
  - 2.8.0
  - 2.8.1
  - 2.9.0
  - 2.9.1
  - 2.9.2
  - 3.0.0
  - 3.0.0rc0
  - 3.0.0rc1
  - 3.0.0rc2
  - 3.0.0rc3
  - 3.0.1
  - 3.1.0
  - 3.1.0rc0
  - 3.1.1
  - 3.1.2
  - 3.1.3
  - 3.1.4
  - 3.10.0rc0
  - 3.2.0
  - 3.2.0rc0
  - 3.3.0
  - 3.3.0rc0
  - 3.3.1
  - 3.3.2
  - 3.4.0
  - 3.4.0rc0
  - 3.5.0
  - 3.5.0rc0
  - 3.5.1
  - 3.6.0
  - 3.6.0rc0
  - 3.7.0
  - 3.7.0rc0
  - 3.8.0
  - 3.8.0rc0
  - 3.8.1
  - 3.9.0
  - 3.9.0rc0
references:
- type: ADVISORY
  url: https://nvd.nist.gov/vuln/detail/CVE-2026-2734
- type: WEB
  url: https://github.com/mlflow/mlflow/commit/6989066af33fdcb03588fd71a1a67f8fc5ef12c9
- type: PACKAGE
  url: https://github.com/mlflow/mlflow
- type: WEB
  url: https://huntr.com/bounties/d632f783-b2c7-4a3b-af5e-1d693e841c08
- type: PACKAGE
  url: https://pypi.org/project/mlflow
- type: ADVISORY
  url: https://github.com/advisories/GHSA-w5xq-c4pf-ghq7
severity:
- type: CVSS_V3
  score: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N