AI analysis
CVE-2026-85912 is a race condition (CWE-362) in the Windows Clipboard User Service, where concurrent use of a shared resource is not properly synchronized. An attacker who already has a low-privileged local account can trigger the race to elevate privileges on the same machine; no user interaction is required, but attack complexity is high. Successful exploitation has high impact on confidentiality, integrity, and availability within the same security boundary. It affects Windows systems that include the Clipboard User Service and was covered by Microsoft’s October 2026 Patch Tuesday updates; exact version ranges are not in the supplied data. It is not in the CISA Known Exploited Vulnerabilities catalog, and no public proof-of-concept is known.
What to do: Install Microsoft’s October 2026 Patch Tuesday security updates on all supported Windows systems after normal testing. Until those updates are applied, keep local accounts at least privilege and watch for unexpected privilege changes, because an attacker must already be logged on locally and win a difficult race. Confirm installation through Windows Update, WSUS, or Intune compliance reporting.
Affected
| Microsoft Windows (Clipboard User Service) | — |
Estimated exposure
massOn the order of 1 billion+ Windows installations — The Clipboard User Service is a built-in component of modern Windows client and server editions, and Windows is deployed on roughly a billion or more PCs and servers worldwide; the advisory data does not list exact affected builds.
Order-of-magnitude estimate by the model from install counts, market share and public scan data it knows; verify before quoting.