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CVE-2026-2734— Authorization Bypass in SearchModelVersions in mlflow/mlflow

Quick assessment

Affected
mlflow mlflow/mlflow
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MLflow是MLflow开源的一个简化机器学习开发的平台，包括跟踪实验、将代码打包成可重复的运行以及共享和部署模型。 mlflow 3.9.0及之前版本存在访问控制错误漏洞，该漏洞源于SearchModelVersions REST API端点和mlflowSearchModelVersions GraphQL查询缺乏适当的每模型授权检查，可能导致经过身份验证的用户枚举所有模型版本。

AI Predicted 5.3 Difficulty: Easy EPSS 0.44% · P37

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
mlflow mlflow/mlflow unspecified< 3.10.0 affected
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I. Basic Information for CVE-2026-2734

Vulnerability Information
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Vulnerability Title
Authorization Bypass in SearchModelVersions in mlflow/mlflow
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
MLflow 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MLflow是MLflow开源的一个简化机器学习开发的平台，包括跟踪实验、将代码打包成可重复的运行以及共享和部署模型。 mlflow 3.9.0及之前版本存在访问控制错误漏洞，该漏洞源于SearchModelVersions REST API端点和mlflowSearchModelVersions GraphQL查询缺乏适当的每模型授权检查，可能导致经过身份验证的用户枚举所有模型版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
mlflow mlflow/mlflow unspecified ~ 3.10.0 -

II. Public POCs for CVE-2026-2734

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III. Intelligence Information for CVE-2026-2734

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Patches & Fixes for CVE-2026-2734 (1)

Vendor Advisories for CVE-2026-2734 (1)

IV. Related Vulnerabilities

Same product: mlflow/mlflow
Same vendor: mlflow
Same weakness: CWE-284

V. Comments for CVE-2026-2734

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