CVE-2026-24291
📋 TL;DR
This vulnerability allows an authorized attacker with local access to exploit incorrect permissions in Windows Accessibility Infrastructure (ATBroker.exe) to elevate privileges. It affects Windows systems where the attacker already has some level of access but can gain higher privileges like SYSTEM. This is a local privilege escalation vulnerability.
💻 Affected Systems
- Windows Accessibility Infrastructure (ATBroker.exe)
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Attacker gains SYSTEM privileges, enabling complete system compromise, installation of malware, credential theft, and persistence mechanisms.
Likely Case
Authorized user or malware with initial access escalates to administrative privileges to bypass security controls and move laterally.
If Mitigated
With proper access controls and monitoring, impact is limited to isolated systems with quick detection and containment.
🎯 Exploit Status
Exploitation requires local access and knowledge of the vulnerability; no public exploit code known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Microsoft Security Update Guide for specific KB numbers
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-24291
Restart Required: Yes
Instructions:
1. Apply the latest Windows security updates from Microsoft. 2. Use Windows Update or download patches from Microsoft Update Catalog. 3. Restart the system as required.
🔧 Temporary Workarounds
Disable ATBroker Service
windowsTemporarily disable the Accessibility Infrastructure Broker service to mitigate the vulnerability.
sc config ATBroker start= disabled
sc stop ATBroker
Restrict Service Permissions
windowsModify permissions on ATBroker.exe to prevent unauthorized access.
icacls "C:\Windows\System32\ATBroker.exe" /deny *S-1-1-0:(RX)
🧯 If You Can't Patch
- Implement strict access controls to limit local user privileges and monitor for suspicious activity.
- Use application whitelisting to prevent execution of unauthorized processes and monitor ATBroker.exe behavior.
🔍 How to Verify
Check if Vulnerable:
Check Windows version and installed updates; compare with Microsoft advisory for affected versions.Check Version:
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Verify Fix Applied:
Verify that the latest security updates from Microsoft are installed and the system has been restarted.📡 Detection & Monitoring
Log Indicators:
- Unusual process creation by ATBroker.exe
- Failed or successful privilege escalation attempts in security logs
- Modifications to ATBroker.exe permissions or service configuration
Network Indicators:
- Not applicable as this is a local exploit
SIEM Query:
EventID=4688 AND ProcessName="ATBroker.exe" AND NewProcessName contains "cmd.exe" OR "powershell.exe"