# CVE-2026-84452

## Summary

- **CVE ID:** CVE-2026-84452
- **Severity:** HIGH
- **CVSS Score:** 8.6 (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)
- **CWE:** CWE-942, CWE-306
- **Published:** Sep 2, 2026
- **Last Modified:** Sep 3, 2026

## 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.

## Affected Products

- microsoft — winml-cli (< 0.4.0)

## References

- [CNA](https://github.com/microsoft/winml-cli/security/advisories/GHSA-96p9-rh4f-92cf)
- [CNA](https://github.com/microsoft/winml-cli/pull/1321)
- [CNA](https://github.com/microsoft/winml-cli/commit/f4073e0ef4700a25b623487e7e45c421ca0b9993)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.95%
- **EPSS Percentile:** 59.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._