Vulnerability · Published May 21, 2026 · Assigned by @huntr_ai
CVE-2026-2734Authorization Bypass in SearchModelVersions in mlflow/mlflow
Medium 6.5
In plain English
A medium-severity improper access control in mlflow/mlflow from mlflow. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | mlflow | 3.10.0 | GHSA-w5xq-c4pf-ghq7 |
| PyPI | mlflow | 3.10.0 | PYSEC-2026-2660 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| mlflow | mlflow/mlflow | unspecified – before 3.10.0 |
Weakness: CWE-284 · Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N