CVE-2026-2652— Authentication Bypass in mlflow/mlflow
Public Exploits 1
Nuclei · 1 CVE-2026-2652.yaml [template]
Possible ATT&CK Techniques 1AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| mlflow | mlflow/mlflow | unspecified< 3.10.0 | affected |
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I. Basic Information for CVE-2026-2652
Vulnerability Information
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Vulnerability Title
Authentication Bypass in mlflow/mlflow
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in mlflow/mlflow versions 3.9.0 and earlier allows unauthenticated access to certain FastAPI routes when the server is started with authentication enabled (`--app-name basic-auth`) and served via uvicorn (ASGI). The FastAPI permission middleware only enforces authentication on `/gateway/` routes, leaving other routes such as the Job API (`/ajax-api/3.0/jobs/*`) and the OpenTelemetry trace ingestion API (`/v1/traces`) unprotected. This allows unauthenticated remote attackers to submit jobs, read job results, cancel running jobs, and inject arbitrary trace data into experiments. The issue arises from an architectural mismatch between Flask and FastAPI authentication mechanisms, where the `_find_fastapi_validator()` function fails to handle non-`/gateway/` paths, resulting in a complete authentication bypass. This vulnerability is fixed in version 3.10.0.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
使用基本弱点进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
MLflow 安全漏洞
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及之前版本存在安全漏洞，该漏洞源于Flask和FastAPI认证机制架构不匹配，导致认证绕过，可能导致未认证远程攻击者提交作业、读取作业结果、取消运行中作业以及向实验注入任意跟踪数据。
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-2026-2652
| # | POC Description | Source Link | Shenlong Link |
|---|---|---|---|
| 1 | A vulnerability in mlflow/mlflow versions 3.9.0 and earlier allows unauthenticated access to certain FastAPI routes when the server is started with authentication enabled (`--app-name basic-auth`) and served via uvicorn (ASGI). The FastAPI permission middleware only enforces authentication on `/gateway/` routes, leaving other routes such as the Job API (`/ajax-api/3.0/jobs/*`) and the OpenTelemetry trace ingestion API (`/v1/traces`) unprotected. This allows unauthenticated remote attackers to submit jobs, read job results, cancel running jobs, and inject arbitrary trace data into experiments. The issue arises from an architectural mismatch between Flask and FastAPI authentication mechanisms, where the `_find_fastapi_validator()` function fails to handle non-`/gateway/` paths, resulting in a complete authentication bypass. This vulnerability is fixed in version 3.10.0. | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-2652.yaml | POC Details |
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Patches & Fixes for CVE-2026-2652 (1)
Vendor Advisories for CVE-2026-2652 (1)
IV. Related Vulnerabilities
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Missing Authorization Validation in mlflow/mlflow - CVE-2026-2734
Authorization Bypass in SearchModelVersions in mlflow/mlflow
Same vendor: mlflow
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MLflow: LogInputs endpoint bypasses per-run UPDATE authoriza - CVE-2026-69148
MLflow: CreateModelVersion source validation does not check - CVE-2026-64849
MLflow: Unauthenticated full-read SSRF in webhook delivery: - CVE-2026-71211
mlflow - Unvalidated Gateway Secret api_base Enables SSRF vi - CVE-2026-8147
Authorization Bypass in mlflow/mlflow
Same weakness: CWE-305
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Deactivated guest accounts can authenticate via magic-link t
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