What is GetProcessHandleFromHwnd API?

It's a Windows function turning HWNDs into process handles, originally via hooks for UI Access, now kernel-direct in Win11.

How does GetProcessHandleFromHwnd enable UAC bypass?

Grabs elevated process handles from low-priv context using Quick Assist's UI Access, skipping prompts even across users.

No—docs wrong, behaviors shifted. Avoid; use proper privilege APIs or expect EDR blocks.

🛡️ Security Tools

Ever wonder why UAC pops up but malware slips through? Blame GetProcessHandleFromHwnd, a Windows API with docs straight out of fantasy land.

Threat Digest Apr 02, 2026 3 min read

GetProcessHandleFromHwnd docs are outdated, claiming hooks and same-user limits that no longer hold. 𝕏
Kernel implementation in Win11 makes UAC bypasses stealthier, evading many EDR tools. 𝕏
Microsoft must update docs and consider deprecation to plug this legacy leak. 𝕏

Published by

Threat intelligence. Zero noise.

#GetProcessHandleFromHwnd #UAC bypass #UIAccess #UIAccess exploits #Windows API

Get the best Cybersecurity stories of the week in your inbox — no noise, no spam.

Originally reported by Google Project Zero