CVE-2026-3422
📋 TL;DR
U-Office Force software has an insecure deserialization vulnerability that allows unauthenticated attackers to remotely execute arbitrary code on affected servers by sending malicious serialized data. This affects all organizations using vulnerable versions of U-Office Force developed by e-Excellence.
💻 Affected Systems
- U-Office Force
⚠️ 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 allowing attackers to install malware, steal sensitive data, pivot to internal networks, and maintain persistent access.
Likely Case
Remote code execution leading to data theft, ransomware deployment, or use as a foothold for further attacks.
If Mitigated
Limited impact if proper network segmentation, WAF rules, and monitoring are in place to detect and block exploitation attempts.
🎯 Exploit Status
Unauthenticated remote code execution vulnerabilities with CVSS 9.8 are frequently weaponized quickly. Attackers can craft malicious payloads without authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific patched version
Vendor Advisory: https://www.twcert.org.tw/en/cp-139-10743-9a952-2.html
Restart Required: Yes
Instructions:
1. Review vendor advisory. 2. Download and apply the latest patch from e-Excellence. 3. Restart U-Office Force services. 4. Verify the patch is applied successfully.
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to U-Office Force servers to only trusted IP addresses
firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="TRUSTED_IP" port protocol="tcp" port="APP_PORT" accept'
netsh advfirewall firewall add rule name="Restrict U-Office" dir=in action=allow remoteip=TRUSTED_IP localport=APP_PORT protocol=TCP
Web Application Firewall Rules
allImplement WAF rules to block serialized data patterns and suspicious requests
🧯 If You Can't Patch
- Isolate affected systems from internet and restrict internal access
- Implement strict monitoring and alerting for suspicious serialization-related activities
🔍 How to Verify
Check if Vulnerable:
Check U-Office Force version against vendor advisory. Monitor for unusual deserialization activity in application logs.Check Version:
Check application admin panel or configuration files for version informationVerify Fix Applied:
Verify patch version is installed and test that malicious serialized payloads are rejected.📡 Detection & Monitoring
Log Indicators:
- Unusual deserialization errors
- Java/.NET serialization-related exceptions
- Unexpected process execution from web application
Network Indicators:
- HTTP requests containing serialized objects to U-Office Force endpoints
- Unusual outbound connections from U-Office Force server
SIEM Query:
source="u-office-logs" AND (deserialization OR "ObjectInputStream" OR "BinaryFormatter")