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VulnerabilityCVE-2026-84452Published 2026-09-02

CVE-2026-84452 — microsoft winml-cli

high (derived)

As of 2026-09-03, CVE-2026-84452 is a High-severity (band derived from the CVSS v4.0 score, not stated by the CNA) vulnerability in microsoft winml-cli, CVSS v4.0 8.6, EPSS 0.9% (58.7th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-84452 as of 2026-09-03; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

CVSS v4.0
8.6/10High (derived)
EPSS
0.9%Higher than 58.7% of scored CVEs
CISA KEV
NoNot in the KEV catalog
Tracked threats
0None linked yet
Priority
6.6/10Threadlinqs triage score
Published
Updated 2026-09-03
CVSS v4.0 8.6 (High, derived from score) · EPSS 0.9% (higher than 58.7% of all scored CVEs) · Priority 6.6/10 · Published 2026-09-02

Last updated:

What is CVE-2026-84452?

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.

The record classifies CVE-2026-84452 under weakness classes CWE-942, CWE-306. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 33 days ago.

Severity and exploitation probability

CVSS v4.0 base score
8.6 — High (derived from 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
EPSS (FIRST)
0.9% probability of exploitation in the next 30 days, higher than 58.7% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
6.6/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-09-02, last modified 2026-09-03

Is CVE-2026-84452 being exploited?

It currently carries a trending score of 44 in the Threadlinqs vulnerability feed.

Affected products and versions

How to fix CVE-2026-84452

No vendor patch reference has been recorded for CVE-2026-84452 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2026-84452

No threat campaign in the Threadlinqs corpus currently references CVE-2026-84452, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

Sources

Enriched from CVE.org, NVD, FIRST EPSS. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.

Vendor advisory and patch

Other references