CVE-2026-2999
📋 TL;DR
CVE-2026-2999 is a critical remote code execution vulnerability in IDExpert Windows Logon Agent that allows unauthenticated attackers to force the system to download and execute arbitrary malicious files from remote sources. This affects all systems running vulnerable versions of IDExpert Windows Logon Agent developed by Changing. Attackers can gain complete control over affected systems without any authentication.
💻 Affected Systems
- IDExpert Windows Logon Agent
⚠️ 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
Complete system compromise leading to ransomware deployment, data exfiltration, lateral movement across networks, and persistent backdoor installation.
Likely Case
Initial foothold for attackers leading to credential theft, malware installation, and network reconnaissance for further attacks.
If Mitigated
Limited impact if network segmentation prevents external access and endpoint protection blocks malicious downloads.
🎯 Exploit Status
The vulnerability description suggests straightforward exploitation requiring only network access to the vulnerable service.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.0.0.1
Vendor Advisory: https://www.changingtec.com/news_detail.jsp?item_id=348
Restart Required: Yes
Instructions:
1. Download version 3.0.0.1 from Changing's official website. 2. Stop the IDExpert Windows Logon Agent service. 3. Install the update. 4. Restart the system. 5. Verify the service is running with the updated version.
🔧 Temporary Workarounds
Network Access Restriction
windowsBlock network access to the IDExpert Windows Logon Agent service using firewall rules
netsh advfirewall firewall add rule name="Block IDExpert Agent" dir=in action=block protocol=TCP localport=[PORT_NUMBER]
Service Disablement
windowsTemporarily disable the IDExpert Windows Logon Agent service if not critically needed
sc stop "IDExpert Windows Logon Agent"
sc config "IDExpert Windows Logon Agent" start= disabled
🧯 If You Can't Patch
- Isolate affected systems in a separate network segment with strict firewall rules
- Implement application allowlisting to prevent execution of unauthorized binaries
🔍 How to Verify
Check if Vulnerable:
Check the installed version of IDExpert Windows Logon Agent via Control Panel > Programs and Features or by examining the service propertiesCheck Version:
wmic product where name="IDExpert Windows Logon Agent" get versionVerify Fix Applied:
Verify the version shows 3.0.0.1 or higher and test that the service functions normally after update📡 Detection & Monitoring
Log Indicators:
- Unusual network connections from IDExpert agent to external IPs
- Unexpected process executions following IDExpert service activity
- Failed update attempts or service restart anomalies
Network Indicators:
- Outbound connections from IDExpert agent to unknown external servers on non-standard ports
- HTTP/HTTPS requests to download executable files triggered by the agent
SIEM Query:
source="windows" AND process_name="IDExpert*" AND (destination_ip!=internal_range OR file_download="*.exe")