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CVE-2026-20817 — Repository dedicated to CVE-2026-20817, providing vulnerability details and exploitation material for this specific security flaw. | Kitploit
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GitHubzerodayevil/cve-2026-20817

CVE-2026-20817

Repository dedicated to CVE-2026-20817, providing vulnerability details and exploitation material for this specific security flaw.

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241136 days agoReviewed by Kitploit

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🛡️ AI Security Tool Module
CVE-2026-20817: Windows Error Reporting (WER) ALPC Local Privilege Escalation

Official Security Audit & Exploitation Module for AI Security Tool Ecosystem

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🌐 Web Demo • 📚 Project Website • 💬 Community Chat

Website Navigation: Home • Updates • Downloads • Modules

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🧠 Conceptual Overview

This module provides diagnostic tools and a Proof-of-Concept (PoC) for CVE-2026-20817, a local privilege escalation vulnerability in the Windows Error Reporting (WER) service. The vulnerability allows an authenticated low-privileged user to execute arbitrary code with SYSTEM privileges by sending specially crafted ALPC messages to the WER service.

Platform Language CVSS Status

📊 Vulnerability Specifications

Specification Assigned Value Notes
CVE Identifier CVE-2026-20817 Windows Error Reporting ALPC LPE
Component Windows Error Reporting (WER) Service ALPC port \WindowsErrorReportingService
Attack Vector Local (ALPC) Authenticated low-privileged user
Vulnerable Method SvcElevatedLaunch (0x0D) Fails to validate caller privileges before launch
Impact & Vector Elevation to SYSTEM Executes WerFault.exe with user-supplied command line
Affected Systems Windows 10/11 & Server 2019/2022 All versions prior to January 2026 Security Update

🔬 Technical Details & Exploit Flow

The WER service exposes an ALPC port named \WindowsErrorReportingService. The flaw exists in the SvcElevatedLaunch method (0x0D), where the service fails to properly validate the caller's privileges before launching WerFault.exe with user-supplied command line parameters from shared memory.

  1. Create shared memory containing arbitrary command line parameters.
  2. Connect to the WER ALPC port.
  3. Send ALPC message with method 0x0D, including client process ID, shared memory handle, and command line length.
  4. WER service duplicates the handle and launches WerFault.exe with the provided command line.
  5. Resulting process runs with SYSTEM privileges.

🛡️ Privileges Obtained

The spawned WerFault.exe process runs with a SYSTEM token containing:

  • SeDebugPrivilege — Debug any process
  • SeImpersonatePrivilege — Impersonate any user
  • Various standard SYSTEM privileges

Note: The token does NOT include SeTcbPrivilege (Act as part of the operating system).

🛠 Native Compilation

# Using Visual Studio Developer Command Prompt (C++17)
cl /EHsc CVE-2026-20817_PoC.cpp

💻 How to Run this Module

⚠️ IMPORTANT: This module is built specifically for safe execution and diagnostics within the AI Security Tool ecosystem. Always use verified modules sourced from official repositories.

1️⃣ Prerequisites & Installation

To execute the monitoring and diagnostic scripts, ensure the AI Security Tool core engine is installed either via pre-built binaries or by building from source:

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