Proof-of-Concept Released: Public Exploit Details for Windows Error Reporting LPE (CVE-2026-20817)

A detailed analysis and proof-of-concept for CVE-2026-20817, a critical local privilege escalation in the Windows Error Reporting service (SvcElevatedLaunch in WerSvc.dll) that allows a low-privilege user to cause WerFault.exe to be launched as SYSTEM via crafted ALPC messages and a File Mapping object; Microsoft mitigated the issue in the January 2026 cumulative update (10.0.26100.7623 or later), but public PoC release raises the likelihood of exploitation where patches are not applied.