Executive Summary

The article examines the Windows API GetProcessHandleFromHwnd, first noted in a Google Project Zero UAC bypass that leveraged Quick Assist’s UIAccess. The API retrieves a process handle from a window handle by injecting code into the target process via a hook, but only succeeds when the caller and target run under the same user. The post reviews the API’s documentation, security implications, and its role in privilege‑escalation techniques.

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Intelligence Metadata - Source Publisher: Google Project Zero - Published Date: 2026-02-26T08:00:00+00:00 - Category: research

"If you surrender to the wind, you can ride it."

— Toni Morrison