CVE-2022-26807
📋 TL;DR
CVE-2022-26807 is a Windows Work Folder Service elevation of privilege vulnerability that allows authenticated attackers to execute arbitrary code with SYSTEM privileges. This affects Windows systems with the Work Folder Service enabled, typically in enterprise environments. Attackers must have valid user credentials to exploit this vulnerability.
💻 Affected Systems
- Windows Work Folder Service
📦 What is this software?
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 11 by Microsoft
Windows 11 by Microsoft
Windows 7 by Microsoft
Windows 8.1 by Microsoft
Windows Rt 8.1 by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
An authenticated attacker gains SYSTEM privileges, enabling complete system compromise, data theft, lateral movement, and persistence establishment.
Likely Case
Privileged users or attackers with stolen credentials escalate to SYSTEM to bypass security controls, install malware, or access sensitive data.
If Mitigated
With proper patch management and least privilege principles, impact is limited to isolated systems with minimal lateral movement potential.
🎯 Exploit Status
Requires authenticated access and specific conditions. No public exploit code was available at disclosure time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: April 2022 security updates (KB5012592 for Windows 10 21H2, KB5012591 for Windows 11, etc.)
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-26807
Restart Required: Yes
Instructions:
1. Apply April 2022 Windows security updates via Windows Update. 2. For enterprise environments, deploy updates through WSUS or SCCM. 3. Restart affected systems after patch installation.
🔧 Temporary Workarounds
Disable Work Folder Service
windowsStop and disable the Windows Work Folder Service if not required for business operations.
sc stop WorkFoldersSvc
sc config WorkFoldersSvc start= disabled
🧯 If You Can't Patch
- Implement network segmentation to isolate systems with Work Folder Service enabled
- Enforce strict access controls and monitor for unusual authentication attempts to Work Folder Service
🔍 How to Verify
Check if Vulnerable:
Check if Work Folder Service is running and system has not applied April 2022 security updates.Check Version:
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Verify Fix Applied:
Verify April 2022 security updates are installed and Work Folder Service version is updated.📡 Detection & Monitoring
Log Indicators:
- Unusual Work Folder Service process creation
- Failed authentication attempts followed by successful Work Folder Service access
Network Indicators:
- Unexpected connections to Work Folder Service ports
- Anomalous authentication patterns
SIEM Query:
EventID=4688 AND ProcessName="WorkFoldersSvc.exe" AND ParentProcess NOT IN ("services.exe", "svchost.exe")