CVE-2026-25893
📋 TL;DR
An authentication bypass vulnerability in FUXA web-based SCADA/HMI software allows unauthenticated remote attackers to gain administrative access via the heartbeat refresh API. This can lead to arbitrary code execution on the server. All FUXA installations prior to version 1.2.10 are affected.
💻 Affected Systems
- FUXA (SCADA/HMI/Dashboard software)
📦 What is this software?
Fuxa by Frangoteam
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with administrative access leading to arbitrary code execution, data theft, system manipulation, and potential lateral movement in industrial control networks.
Likely Case
Unauthorized administrative access to FUXA dashboard allowing configuration changes, data viewing/modification, and potential code execution depending on attacker skill.
If Mitigated
Limited impact if proper network segmentation and access controls prevent external access to FUXA instances.
🎯 Exploit Status
The vulnerability is in the heartbeat refresh API which appears to be a straightforward authentication bypass. No authentication required makes exploitation simple.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.2.10
Vendor Advisory: https://github.com/frangoteam/FUXA/security/advisories/GHSA-vwcg-c828-9822
Restart Required: Yes
Instructions:
1. Backup current FUXA configuration and data. 2. Stop FUXA service. 3. Update to version 1.2.10 using package manager or manual installation. 4. Restart FUXA service. 5. Verify functionality.
🔧 Temporary Workarounds
Network Access Restriction
linuxRestrict network access to FUXA instances using firewall rules to only allow trusted IP addresses.
iptables -A INPUT -p tcp --dport [FUXA_PORT] -s [TRUSTED_IP] -j ACCEPT
iptables -A INPUT -p tcp --dport [FUXA_PORT] -j DROP
Reverse Proxy with Authentication
allPlace FUXA behind a reverse proxy (nginx/apache) with additional authentication layer.
🧯 If You Can't Patch
- Isolate FUXA instances on separate network segments with strict firewall rules
- Implement network monitoring and intrusion detection for unauthorized access attempts
🔍 How to Verify
Check if Vulnerable:
Check FUXA version via web interface or configuration files. If version is below 1.2.10, system is vulnerable.Check Version:
Check FUXA web interface or configuration files for version informationVerify Fix Applied:
After updating, verify version is 1.2.10 or higher and test that authentication is required for all administrative functions.📡 Detection & Monitoring
Log Indicators:
- Unauthenticated access to heartbeat API endpoints
- Administrative actions from unexpected IP addresses
- Multiple failed authentication attempts followed by successful administrative access
Network Indicators:
- Unusual traffic patterns to FUXA heartbeat endpoints
- Administrative API calls from unauthenticated sources
SIEM Query:
source="fuxa.log" AND (uri="/api/heartbeat" OR uri="/heartbeat") AND response_code=200 AND auth_status="none"