{"id":"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.","aliases":["GHSA-96p9-rh4f-92cf"],"modified":"2026-09-05T03:30:54.328640738Z","published":"2026-09-02T19:22:55.672Z","database_specific":{"unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"fixed":"0.4.0"}]}],"cna_assigner":"GitHub_M","cwe_ids":["CWE-306","CWE-942"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84452.json"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/microsoft/winml-cli","events":[{"introduced":"0"},{"fixed":"f4073e0ef4700a25b623487e7e45c421ca0b9993"}],"database_specific":{"source":"REFERENCES"}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-84452.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}