CVE-2026-1791
📋 TL;DR
This vulnerability allows attackers to upload malicious files to Hillstone Networks Operation and Maintenance Security Gateway, potentially enabling web shell deployment and server compromise. It affects Linux-based installations of the specified security gateway version.
💻 Affected Systems
- Hillstone Networks Operation and Maintenance Security Gateway
⚠️ 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 via web shell leading to data exfiltration, lateral movement, and persistent backdoor access.
Likely Case
Unauthorized file upload leading to web shell installation and limited server control.
If Mitigated
File upload attempts blocked or detected with no successful exploitation.
🎯 Exploit Status
CWE-434 vulnerabilities typically require some level of access to the upload functionality, but details about authentication requirements are not specified in the CVE description.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for updated version
Vendor Advisory: https://www.hillstonenet.com.cn/security-notification/2025/12/08/wgscld/
Restart Required: Yes
Instructions:
1. Review vendor advisory at provided URL
2. Download and apply the recommended patch/update from Hillstone Networks
3. Restart the security gateway service
4. Verify the update was successful
🔧 Temporary Workarounds
Restrict File Upload Types
linuxConfigure the gateway to only accept specific safe file types for upload
# Configuration depends on Hillstone gateway settings - consult documentation
Network Segmentation
allRestrict access to the gateway's management interface to trusted networks only
# Use firewall rules to limit access to specific IP ranges
🧯 If You Can't Patch
- Implement strict file type validation on the upload functionality
- Monitor file upload directories for suspicious files and implement file integrity monitoring
🔍 How to Verify
Check if Vulnerable:
Check the gateway version via web interface or CLI; if version is V5.5ST00001B113, the system is vulnerable.Check Version:
# Check via Hillstone gateway CLI or web interface - specific command varies by deploymentVerify Fix Applied:
Verify the version has been updated to a patched release as specified in the vendor advisory.📡 Detection & Monitoring
Log Indicators:
- Unusual file upload activity
- Web shell file creation in upload directories
- Unauthorized access attempts to upload functionality
Network Indicators:
- HTTP POST requests with file uploads to gateway endpoints
- Suspicious outbound connections from the gateway
SIEM Query:
source="hillstone_gateway" AND (event="file_upload" OR uri="*upload*")