Windows Exploitation Techniques: Dangling COM Object Registrations

As cited

Copy frozen at 2026-09-21 19:19 UTC (site build).

vulnerabilities

Windows Exploitation Techniques: Dangling COM Object Registrations

Microsoft patched CVE-2026-66804, an incomplete fix for CVE-2026-50343 (Dark Elevator), which involved a dangling COM object registration for CrossDevice with a missing server DLL in a world-writable directory. Researchers detail how custom COM marshaling can be abused to load arbitrary DLL code into privileged processes, specifically by targeting the Shell Create Object Handler service that runs as SYSTEM without custom marshaling protections. The blog provides exploitation techniques and PowerShell methods to identify other dangling COM registrations on Windows systems.

Why it matters: Windows administrators and security teams must verify whether systems are patched for CVE-2026-66804 and CVE-2026-50343, as the exploitation path is practical and leads to privilege escalation; developers using COM objects should audit registry permissions and ensure server DLLs exist in protected paths.

Source published

2026-09-21 07:00 UTC

First seen by Cybersecurity Tracker

2026-09-21 18:12 UTC