{"id":"CVE-2026-84452","aliases":["GHSA-96p9-rh4f-92cf"],"url":"https://o3.security/vulnerability/CVE-2026-84452","summary":"Windows ML CLI: CORS misconfig enables localhost RCE","details":"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.","published":"2026-09-02T19:22:55.672Z","modified":"2026-09-04T03:46:44.091608332Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/microsoft/winml-cli/commit/f4073e0ef4700a25b623487e7e45c421ca0b9993","label":"microsoft/winml-cli@f4073e0"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84452.json"},{"type":"ADVISORY","url":"https://github.com/microsoft/winml-cli/security/advisories/GHSA-96p9-rh4f-92cf"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-84452"},{"type":"FIX","url":"https://github.com/microsoft/winml-cli/commit/f4073e0ef4700a25b623487e7e45c421ca0b9993"},{"type":"FIX","url":"https://github.com/microsoft/winml-cli/pull/1321"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-04T03:46:44.091608332Z"}}