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CVE-2026-84452— Windows ML CLI: CORS misconfig enables localhost RCE

Quick assessment

Affected
microsoft winml-cli
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.

Microsoft Windows ML CLI是美国Microsoft公司的一款机器学习模型命令行工具。 Microsoft Windows ML CLI 0.4.0之前版本存在安全漏洞，该漏洞源于src/winml/modelkit/serve/cli_api.py组件通过localhost HTTP API未认证暴露WinML CLI命令，且allow_origins设置为通配符，恶意网站可发送跨域请求并设置trust_remote_code参数为true，导致从攻击者控制的模型仓库导入Python

CVSS 8.6 · High EPSS 1.61% · P76

Affected Version Matrix 1

VendorProduct Version RangeStatus
microsoft winml-cli < 0.4.0 affected
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I. Basic Information for CVE-2026-84452

Vulnerability Information
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Vulnerability Title
Windows ML CLI: CORS misconfig enables localhost RCE
Source: CVE Program / CVE List V5
Vulnerability Description
Windows ML CLI is a command line tool for building portable, performant, and high-quality AI models for Windows ML. Prior to 0.4.0, the src/winml/modelkit/serve/cli_api.py component exposes WinML CLI commands through a localhost HTTP API without authentication and configures the allow_origins setting as a wildcard in both src/winml/modelkit/serve/cli_api.py and src/winml/modelkit/serve/app.py. A malicious website loaded by a user can send cross-origin requests to /v1/cli/build or /v1/cli/config and set the trust_remote_code parameter to true, which is converted to the --trust-remote-code command-line flag without validation. This reaches AutoConfig.from_pretrained with trust_remote_code=True in src/winml/modelkit/loader/_autoconfig.py and imports Python code from an attacker-controlled model repository, resulting in arbitrary code execution as the server user. This issue is fixed in version 0.4.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
过度许可的跨域白名单
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Windows ML CLI 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Windows ML CLI是美国Microsoft公司的一款机器学习模型命令行工具。 Microsoft Windows ML CLI 0.4.0之前版本存在安全漏洞，该漏洞源于src/winml/modelkit/serve/cli_api.py组件通过localhost HTTP API未认证暴露WinML CLI命令，且allow_origins设置为通配符，恶意网站可发送跨域请求并设置trust_remote_code参数为true，导致从攻击者控制的模型仓库导入Python
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
microsoft winml-cli < 0.4.0 -

II. Public POCs for CVE-2026-84452

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III. Intelligence Information for CVE-2026-84452

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Patches & Fixes for CVE-2026-84452 (1)

Vendor Advisories for CVE-2026-84452 (1)

IV. Related Vulnerabilities

Same vendor: microsoft
Same weakness: CWE-942

V. Comments for CVE-2026-84452

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