Vulnerability 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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/mlflow/mlflow/commit/6989066af33fdcb03588fd71a1a67f8fc5ef12c9
- https://huntr.com/bounties/d632f783-b2c7-4a3b-af5e-1d693e841c08
- https://huntr.com/bounties/d632f783-b2c7-4a3b-af5e-1d693e841c08
FAQ
What is CVE-2026-2734?
CVE-2026-2734 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 authenticatio...
How severe is CVE-2026-2734?
CVE-2026-2734 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-2734?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.